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Author Topic: Speeding reduces gas mileage per gallon. Back to Topics
tazdriver

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Message Posted: Dec 31, 2007 10:38:27 AM

Must be some state of denial (not talking about some place in Egypt) when we speed and at the same time complain about high gas prices. It has been shown time and time again that slowing down could single handedly cut in half the amount of gasoline we consume. So why do we speed?
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GasMiser718
Champion Author Detroit

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Message Posted: Nov 5, 2014 12:40:01 PM

I don't speed so I really couldn't tell you.
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dontuknowOH
Champion Author Ohio

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Message Posted: Nov 1, 2014 11:01:47 AM

I just love debates with Clarifications, it enlightens the information given. fuel savings has been a heavy topic, Home and vehicle, concerns. The Wife say I have become a vehicle tire watcher as I drive, She hates that. Well... because She still buys partially Her own fuel, then asks Me.... "Since when did you check My tires... pressure last"? I watched that Dash thingee Dear... go out! "Oh that's right"

Is hard acceleration considered "Speeding"? Routine Stomp...actually...
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pinbuster2005
Champion Author New Hampshire

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Message Posted: Oct 31, 2014 6:36:22 PM

shockjock - "With the US Average being almost 25, I would have to disagree with you, especially when you nit-pick tenths of a mpg difference as being "wasteful"..."

Again in your opinion as far as my automobile being a gas guzzler. Tenths of a mpg? If I average 10 mph over the posted speed limit my mileage drops by more than 10% on average that isn't 10ths that is full miles. I'll tell you as well that's been the way with EVERY automobile I've ever owned including the economy cars I've owned. I've always driven to get maximum mileage out of every automobile I've owned that's why I've always done far better than the EPA's estimates. In fact when I had my 2001 F-150 pick-up that people like you would call a gas guzzler I averaged 20.5 mpg with it (EPA estimates overall 19) and on a long distance trip I averaged between 23-24 mpg with it. Granted I do 95% of my driving at highway speeds 55-65 mph and 5% in town where as the EPA estimates are for driving 55% in-town and only 45% highway.

" Hardly. I have two vehicles, one which gets an avergae of 28mpg, and the other 50. I am "wasting" far less gas then you, even if I were speeding along at 80mph, then you do by driving your gas guzzler at 55..."

But if you were driving your 28 mpg auto at the speed limit instead of 10mph over that might increase to 30 mpg and your 50 mpg auto might increase to 55 mpg or better. I don't know where your getting I'm only doing 55 all the time. If you would ever bother to read the whole post you would know on the interstate I'm doing the posted 65 mph speed limit. It's been proven many times that speeding will drop your fuel economy 5-15% even at my 22.5 mpg average that is a 1.125 mpg drop in fuel economy at 5% and 3.375 mpg drop at 15% that adds up to a lot of gallons wasted. But by driving to get peak fuel economy I'm not wasting those gallons of gas and keeping that money in my pocket. Also it would cost me more in registration, inspection, insurance, up keep to have two automobiles than what I'd save in fuel. So I'm saving more by having just one automobile that I can use for everything.

"The usual minimum on an interstate is 45, so if you are so concerned about wasting gasoline, why are you not driving the minimum?"

Again the speed limit is 65 mph and my peak mileage RPM range is between 1500 - 2000 and that is what I'm at doing the speed limit of 65 mph on the interstate and 55 mph on the state road.







[Edited by: pinbuster2005 at 10/31/2014 6:38:48 PM EST]
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Shockjock1961
Champion Author Illinois

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Message Posted: Oct 31, 2014 10:38:58 AM

"First off no need to get nasty about it."

Actually PB it was a mistake on my part. I just finished a a post to another user (FuelUser) in another forum and I mistakenly added his abbreviated moniker when I meant to use yours. My apologies...

"Last I knew an average of 22 mpg wasn't a gas guzzler."

With the US Average being almost 25, I would have to disagree with you, especially when you nit-pick tenths of a mpg difference as being "wasteful"...

" Also more fuel is wasted by the way people drive than by what they drive."

Hardly. I have two vehicles, one which gets an avergae of 28mpg, and the other 50. I am "wasting" far less gas then you, even if I were speeding along at 80mph, then you do by driving your gas guzzler at 55...

"Because if the speed limit is 55 then I'm driving 55 if it's 65 I'm driving 65 plus you can get a ticket for driving below the minimum on the interstate just as much as you can get one for speeding."

The usual minimum on an interstate is 45, so if you are so concerned about wasting gasoline, why are you not driving the minimum?

[Edited by: Shockjock1961 at 10/31/2014 10:41:05 AM EST]
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Shockjock1961
Champion Author Illinois

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Message Posted: Oct 31, 2014 10:18:19 AM

"Speeding is defined as "driving over the posted speed limit."

So yes, speeding does reduce miles per gallon when compared to driving the posted limit."

Once again, not necessarily true. I get better gas mileage driving 60 then I do driving the posted 55.
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Valandingham
Champion Author Washington

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Message Posted: Oct 31, 2014 8:34:00 AM

Yes but what really drives down the gas mileage is when a person doing the speed limit or slightly over has to Slow Down because of the Stupid Driver that is driving Under the Posted Speed Limit by 5 to 10 Miles Per Hour on the Freeway in the Left Lane thinking they are saving Fuel instead if taking a road with a Reduced Speed Limit to get to their destination.
In the State of Washington we have 2 road signs on the freeways that mean the same thing and conform to the same law.RCW 46.64.100 Keep Right Except when passing.
The 2 different signs say
1) "State Law Requires All Traffic 'KEEP RIGHT EXCEPT TO PASS'"
2) SLOWER TRAFFIC KEEP RIGHT

Way too many people will stay in the Left Lane and NOT PASS but instead IMPEDE TRAFFIC.
The biggest violators are the Members of the Washington State Patrol's Aggressive Driving Unit. They use this as an illegal excuse to write ILLEGAL SPEEDING TICKETS.

[Edited by: Valandingham at 10/31/2014 8:35:30 AM EST]
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rando991
Champion Author Missouri

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Message Posted: Oct 31, 2014 8:02:19 AM

People who drive 5-10 miles an hour under the speed limit to prevent exceeding it by 1 mph, CANNOT know what gas mileage is over the speed limit, and thus those who do this because they think they are saving mpg are doing so, only because "that's I was told," not because of any facts.
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GLM4205
Champion Author Toledo

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Message Posted: Oct 31, 2014 5:54:15 AM

Depends???
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StArrow68
Champion Author Oakland

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Message Posted: Oct 30, 2014 4:19:16 AM

Yes, a performance driving school would help many folks understand lots of things they have misconceptions about related to driving and even gas mileage. If folks would just learn to look ahead more they would anticipate lane changes and use their brakes much less, which in turn reduces the amount of fuel they use to turn into heat at the rotors. That would allow higher average speed and better mpg. Alas, there are some who could take a class and not benefit much.
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dchawk81
Sophomore Author Pennsylvania

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Message Posted: Oct 29, 2014 5:24:45 PM

Speeding is defined as "driving over the posted speed limit."

So yes, speeding does reduce miles per gallon when compared to driving the posted limit. Any physics major with a passing grade will agree, and having a goofy picture of Einstein doesn't make your opposing argument valid.
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pinbuster2005
Champion Author New Hampshire

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Message Posted: Oct 29, 2014 4:57:04 PM

shockjock - "FU, I tell the same thing to people like you who choose to drive a gas guzzler. Stop complaining about how others "waste" gas when you yourself are doing a far better job of it then most of the people you complain about... "

First off no need to get nasty about it. Second I'm glad you THINK my mini van is a gas guzzler. Last I knew an average of 22 mpg wasn't a gas guzzler. Besides as I've told you before I'm saving a lot more money by driving one automobile that I can do everything with than by having two automobiles and have one sitting while using the other all the while paying for two registrations, two inspections, up keep on two, & insurance on two automobiles. Also more fuel is wasted by the way people drive than by what they drive. I feel what someone drives is their concern as well as how they drive unless it puts me in danger. This is a discussion and that is what it's supposed to be. But your one of those people that if someone doesn't agree with you you say they are wrong with out anything to back up what your saying including tests of your own. Even if it's not done in a controlled environment at least it give some of your arguments something to back them up but you have never provided anything of the sort.

"Then why are you not driving 35 mph or less, you know, to increase the time you have to react and reduce the possiblilty of injury or death? "

Because if the speed limit is 55 then I'm driving 55 if it's 65 I'm driving 65 plus you can get a ticket for driving below the minimum on the interstate just as much as you can get one for speeding.

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thebigv
All-Star Author Ottawa

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Message Posted: Oct 29, 2014 1:41:51 PM

first thing ALL OF YOU need to do is go to a race driving school...
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StArrow68
Champion Author Oakland

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Message Posted: Oct 29, 2014 1:34:17 PM

Thanks for the link, some peak at 35mph, and the number that peak at 60 seems pretty small. Try mpgforspeed.com and look at the graph. Also Consumer Reports did a 2009 study that shows significant loss of mph from 55 to 65 on everything they tested. You may have one of the only cars that gets better mpg at 60 than 55 but for the vast majority, no matter what they believe, their mpg goes down as speed builds.
That's not to say that time isn't worth the money for extra gas, less costly today than in past months. Speed does reduce mpg, on average for most folks. That may or may not involve speeding.

[Edited by: StArrow68 at 10/29/2014 1:40:23 PM EST]
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Shockjock1961
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Message Posted: Oct 29, 2014 11:54:21 AM

"No amount of time saved is worth the possibility of being injured or maybe dead to me."

Then why are you not driving 35 mph or less, you know, to increase the time you have to react and reduce the possiblilty of injury or death?
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Shockjock1961
Champion Author Illinois

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Message Posted: Oct 29, 2014 11:52:19 AM

" So I tell them not to complain about their fuel economy if they are willing to do anything to help improve it"

FU, I tell the same thing to people like you who choose to drive a gas guzzler. Stop complaining about how others "waste" gas when you yourself are doing a far better job of it then most of the people you complain about...
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Shockjock1961
Champion Author Illinois

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Message Posted: Oct 29, 2014 11:49:55 AM

"I get my best mileage highway @ near 64 MPH., better than 55"

There you go. If you are traveling 64 on a road posted 55, then you are getting better gas mileage speeding then you were obeying the law. That's why it's ridiculous to claim that "Speeding reduces gas mileage per gallon"...
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dontuknowOH
Champion Author Ohio

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Message Posted: Oct 29, 2014 11:18:31 AM

I like my Currant rate, wouldn't know what anyone else's is but don't care either. That would be your choice.

States understand why they have their own areas of posted regulation, and each drivers choice may not confirm with those higher zones, like zoned 80 then running 95 MPH. Your choice right using maybe more fuel getting around them.
Simply they don't make you drive right on the limits, because of your cruise control, and your abilities, abilities of others maybe are not up to average, close but not quite.

I think all cars should be the color of black, less eye strain, Flat Black (no glare) Next year all White vehicles, I then could get the darkest windows tint available. Choices are NICE! It makes for $$$$$$$ spending!

SPEEDING is a loose word like LOOKING, needs defined..... I think so.....
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Valandingham
Champion Author Washington

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Message Posted: Oct 29, 2014 8:34:02 AM

If this is the case. Then let me ask
All of you this question.
Why do some states have speed limits of 70, 75, 80, and 85 miles per hour if these speeds are considered SPEEDING?

If your doing a 85 miles per hour in a 85 zone then your not speeding it is not reducing your fuel economy but increasing your fuel economy which makes the statement "Speeding Reduces Gas Mileage" incorrect.

The only reason that is, because you have to SLOW DOWN for the SLOWPOKE who has NO BUSINESS on the freeway or in the fast lane driving below the posted speed limit.
(Note: The Slower Driver is usually going under the posted speed limit causing traffic backups. When you get around them you have to speed up using more fuel than if you maintained your current rate.)
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OilerFan
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Message Posted: Oct 29, 2014 7:43:43 AM

It should be common sense, but I think most don't give any thought to what happens when you push the accelerator pedal down.
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badbobKY
All-Star Author Lexington

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Message Posted: Oct 29, 2014 7:06:40 AM

yes
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hoopitup2000
Champion Author Virginia

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Message Posted: Oct 29, 2014 7:02:46 AM

"So why do we speed?"That's why we call it the "Rat Race"!!
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cv
Champion Author Raleigh

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Message Posted: Oct 29, 2014 5:02:32 AM

Quick starts and stops don't help either.
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pinbuster2005
Champion Author New Hampshire

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Message Posted: Oct 29, 2014 2:57:25 AM

shockjock - "If your car peaks at 60, then obviously you are going to get as good o if not better gas mileage then you do at 55... "

It depends on the automobile and the gearing of the tranny. I know from the tachometer in my automobile that my best mileage is from 55 to 65 mph because that is when my engine is running between 1500 and 2000 RPMs. That is the range that most mechanics will say you will get your peak mileage. At 55 it's at 1500 and at 65 it's at 2000. At 60 mph it's right in between. For my 54 mile round trip drive back and forth to work I'm 51.4 miles of that traveling at 55 mph or better because half of that is on a state road with a speed limit of 55 mph and half is on the interstate at 65 mph. The other 2.6 miles is on and off ramps & in-town/city roads. So like donkuknowOH when I talk about speeding I'm talking about people that drive 10 mph or more over the posted speed limit. I know people that have admitted to me that they constantly drive at least 10 mph over the speed limit and then complain that they don't get good fuel economy out of their automobiles. I've told those people to drive the speed limit and they say "but it will take me longer". So I tell them not to complain about their fuel economy if they are willing to do anything to help improve it.

hotrod - "Btw, 80mph isn't speeding on the rural interstates in WY anymore. I'm so glad they raised the speed limit here so now, per the topic title, I can get the best mileage at 80mph instead of 75 because I'm still not speeding. "

There is a section of one of the interstates in this area that the state raised the speed limit to 70 mph from 65 mph if I'm in that area I'm doing that 70 mph and people are still passing me like I'm hooked to the guard rail. But also since the speed limit was raised the amount of accidents in that section of interstate has gone up considerably. Also I've traveled in areas where the speed limit on the interstate was 75 mph and again people were still passing me like I'm hooked to the guard rail.

"...like one of those Pronghorns dashing out from the tree line half a mile off the road. I think I'll have time to react, even at 80 mph."

That's fine as far as an animal jumping out in front of you goes but what about other unforeseen things that involve other automobiles? those kind of things you might not have time to react to. Like someone having a blow out and lose control of their automobile Or a big truck shredding a tire and pieces are flying out. I've seen these things happen and if I was going that 10 mph faster on the interstate I might have been part of the accident or had a piece of truck tire hit my windshield. No amount of time saved is worth the possibility of being injured or maybe dead to me.
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FrankLee1
All-Star Author Minnesota

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Message Posted: Oct 29, 2014 12:41:49 AM

Some folks have no use for logic; the Laws of Physics don't apply to them either.
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dontuknowOH
Champion Author Ohio

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Message Posted: Oct 28, 2014 8:17:13 PM

Shockjock1961 reply; I can go along with the 60MPH. even higher toward even 70 MPH. as a travel speed.

Speeding is rather a loose term, like faster than average for any mainly posted regulation such as zoned areas. Modern vehicles have improved aerodynamically, engines breath better with a more higher torque range, plus more HP developed with smaller size engines.

The speed thing I was referring to was 15....20 MPH. over the limits, that takes a wide percentage of throttle opening energy propelling vehicles against natures forces. In high/over-drive gearing any vehicle's engine is loaded nearing the top end of it's capacity, unless it's a race car.

I get my best mileage highway @ near 64 MPH., better than 55, but at a constant 42+ MPH. with non traffic messing or lights changing the flow I can do better on level terrain. My O-drive kicks in about 37 mph., even less at times. Be safe!
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Shockjock1961
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Message Posted: Oct 28, 2014 3:09:52 PM

"They can believe anything they want, but facts suggest that they are possibly misinformed."

It's really simple. They, like I, keep track of my gas mileage. For instance. I traveled through Iowa and back this weekend. My records show that When I was on the interstate traveling between 70 and 75 mph, my gas mileage was averaging about 32.4mpg. After I got off the interstate, I tried to maintain my speed around 60 and traveled an additional 210 miles to my destination and I my mileage averaged about 34.5mpg. Coming back, I tried to keep my speed down to around 55, mileage averaged about 34.1mpg.

As for a study please note the graph produced by the EPA on the following link:

According to the U.S. Department of Energy (DOE), most cars’ fuel efficiency peaks at speeds from 35 to 60 miles per hour

If your car peaks at 60, then obviously you are going to get as good o if not better gas mileage then you do at 55...
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StArrow68
Champion Author Oakland

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Message Posted: Oct 28, 2014 2:32:53 PM

ShockJ...., get better mileage at 60 than 55 based on what? They can believe anything they want, but facts suggest that they are possibly misinformed. Belief does not change the laws of nature. Again, show us a study that supports getting better mpg at higher mph, simple, join the age of reality.
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Sugarshaneo7
Veteran Author Michigan

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Message Posted: Oct 28, 2014 10:28:49 AM

ok
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Shockjock1961
Champion Author Illinois

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Message Posted: Oct 28, 2014 8:51:27 AM

"I think you already know why at 30 MPH a vehicle gets poorer mileage"

dontuknowOH, you are the one who made the claim that More speed requires more energy, more energy requires more fuel. I'm just showing that this is not always true. Most people I know get better gas mileage at 60 as opposed to 55. So in that case speeding does not reduce gas mileage...
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twt
Champion Author Virginia Beach

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Message Posted: Oct 28, 2014 7:04:20 AM

Of course, speeding reduces gas mileage. How hard is that, to figure out?
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StArrow68
Champion Author Oakland

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Message Posted: Oct 28, 2014 4:05:54 AM

ShockJ......, show us facts not claims that there are cars getting better mpg at 65 than 55. If you are in top gear at 55 then you have to increase rpm's to get to 65, that will reduce mpg. If you are not in top gear, well you probably should be. My Corvette gets it's best mpg at about 37 mph in 6th gear, just about idle, 750 rpm. At 70 I'm only up to about 1500 rpm and still getting close to 30mpg.
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pinbuster2005
Champion Author New Hampshire

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Message Posted: Oct 28, 2014 12:49:36 AM

hotrod - "...like one of those Pronghorns dashing out from the tree line half a mile off the road. I think I'll have time to react, even at 80 mph."

That's where there is a difference in this area our tree lines aren't a half a mile off the road. Here the tree line might be 100 feet at the most off the road in some areas it's less than that.
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HotRod10
Champion Author Wyoming

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Message Posted: Oct 27, 2014 7:41:42 PM

"Which might turn out to be a poor decision if you don't make it to your destination because you had less time to react to an unforeseen circumstance..."

...like one of those Pronghorns dashing out from the tree line half a mile off the road. I think I'll have time to react, even at 80 mph.

Btw, 80mph isn't speeding on the rural interstates in WY anymore. I'm so glad they raised the speed limit here so now, per the topic title, I can get the best mileage at 80mph instead of 75 because I'm still not speeding.
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carinthuist
Champion Author San Francisco

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Message Posted: Oct 27, 2014 2:09:44 PM

yes
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pinbuster2005
Champion Author New Hampshire

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Message Posted: Oct 27, 2014 1:01:27 AM

shockjock - "And the outcome would probably have been the same regardless of whether you were going 50 or 60 mph... "

Maybe other than the amount of impact and damage done. The impact at 55 mph would be less than at 65 mph. so there would be less damage done.

"Then why do you get worse mileage doing 30 mph then you do going 60? "

Because when your doing 30 mph your not in your overdrive gear and the engine is at a higher rpm for the slower speed. Also most of the time when your going that slow your in town/city and you'll be into stop and go traffic and that lowers your mpg as well. that's why I avoid going thru town or thru the city when possible.

[Edited by: pinbuster2005 at 10/27/2014 1:04:49 AM EST]
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dontuknowOH
Champion Author Ohio

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Message Posted: Oct 26, 2014 8:38:47 PM

Shochjock1961 reply; I think you already know why at 30 MPH a vehicle gets poorer mileage, anyway.... most vehicles, automatics anyway seldom shift into top gearing at 30 MPH except maybe down hill with the go pedal completely released.

Your ground travel coverage in distance is then covered by higher engine rpms per distance covered. A..trannies have governor controls, some are regulated by the ECM system. Often use monitor signals from the engine sensors as to what is the engine torque load/per rpms presently in use.

Also modern vehicles retune your engine timing as you drive against the road circumstances. Thirty MPH is quite slow to be moving in high gearing expecting good travel mileage, maybe a std. might handle that gentle lugging, Torque converters eliminate the lugging at slow speeds. MYOP....

Wasting/saving fuel is up to your/choices.....
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Shockjock1961
Champion Author Illinois

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Message Posted: Oct 26, 2014 3:01:10 PM

"The one time I hit the that deer it was on a corner and the deer was on a dead run out of the woods. there was no way of avoiding it. things like that happen on the road and you never know when."

And the outcome would probably have been the same regardless of whether you were going 50 or 60 mph...
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Shockjock1961
Champion Author Illinois

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Message Posted: Oct 26, 2014 2:59:28 PM

"More speed requires more energy, more energy requires more fuel, reason= that's the way it is on this planet."

Then why do you get worse mileage doing 30 mph then you do going 60?
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pinbuster2005
Champion Author New Hampshire

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Message Posted: Oct 26, 2014 2:45:14 PM

hotrod - "In my 28 years of driving, I've never hit anything. I've usually driven 5-10mph over the speed limit. Maybe speeding is safer after all."

The one time I hit the that deer it was on a corner and the deer was on a dead run out of the woods. there was no way of avoiding it. things like that happen on the road and you never know when.

"It's not free money, it costs you time. Time you could be home with your family. You may not value spending extra time with your family, but it's worth a lot to some people."

Time spend with your family is worth a lot but like I said before an extra 9 mins a day is not a big deal. I can take the money I'm saving not putting it in the gas tank and spend it going out to dinner a few extra times with my girl friend instead where we will spend quality time together as well.

" OTOH, spending extra time cooped up in a car with the family to save a few bucks on gas is not what I consider "quality time". I'll spend the $5 to get the grandparents house an hour earlier so the kids can spend that little extra precious time with them. "

I'll spend a little extra time on the road to have an extra few seconds of reaction time to avoid an accident because some idiot wants to be stupid and get there safe instead of maybe not getting there at all. Because like I said before my life is worth a lot more than a few extra mins on the road.

weaslespit - "Which might turn out to be a poor decision if you don't make it to your destination because you had less time to react to an unforeseen circumstance...

Anybody who sweats 'minutes' needs to take a single 'minute' to see the bigger picture."

The problem with a lot of people today is that they are in too much of a hurry. They want everything instantly.

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carinthuist
Champion Author San Francisco

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Message Posted: Oct 26, 2014 11:54:24 AM

yes
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dontuknowOH
Champion Author Ohio

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Message Posted: Oct 26, 2014 9:51:45 AM

More speed requires more energy, more energy requires more fuel, reason= that's the way it is on this planet. Also big Dogs require more food, more room, bigger housing, bigger toys, drink more water, ETC = more waste/crap, that's planet Earth "stuff".... Any Other Methods? .........
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redfish67
Champion Author Dallas

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Message Posted: Oct 26, 2014 9:42:08 AM

because we're impatient and always in a hurry
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puddy
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Message Posted: Oct 26, 2014 7:59:03 AM

Yes
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dchawk81
Sophomore Author Pennsylvania

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Message Posted: Oct 26, 2014 5:28:08 AM

I don't overthink it the way a lot of folks seem to. I jump in my car and I go. Sometimes I'm frisky on the pedal, sometimes I'm not. I usually set cruise at 68-70 in a 65 zone because it feels pretty right. I might do 15 over on a back road. I might not.

I basically just drive what I feel is safe for the road conditions and my surrounding environment. That's about it.
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FrankLee1
All-Star Author Minnesota

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Message Posted: Oct 26, 2014 4:44:45 AM

I accrue less than 6000 miles/year so I'm wasting FAR less time sitting in cars than the average bear, even though I go the speed limit or even up to 10 mph under.
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Weaslespit
Champion Author Cincinnati

Posts:17,490
Points:582,105
Joined:Sep 2008
Message Posted: Oct 26, 2014 2:54:38 AM

"I'll spend the $5 to get the grandparents house an hour earlier so the kids can spend that little extra precious time with them."

Which might turn out to be a poor decision if you don't make it to your destination because you had less time to react to an unforeseen circumstance...

Anybody who sweats 'minutes' needs to take a single 'minute' to see the bigger picture.
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HotRod10
Champion Author Wyoming

Posts:3,740
Points:62,975
Joined:Oct 2006
Message Posted: Oct 26, 2014 12:13:09 AM

"Not saying your not a safe driver even at the faster speed but you never know what can happen on the road. In 26 years of driving I've had only one accident and that was hitting a deer..."

In my 28 years of driving, I've never hit anything. I've usually driven 5-10mph over the speed limit. Maybe speeding is safer after all.

"I'm still saving $296.67 a year in gas so I'm only making $5.42/hr for that time. big deal it's free money just costs me a little time."

It's not free money, it costs you time. Time you could be home with your family. You may not value spending extra time with your family, but it's worth a lot to some people. OTOH, spending extra time cooped up in a car with the family to save a few bucks on gas is not what I consider "quality time". I'll spend the $5 to get the grandparents house an hour earlier so the kids can spend that little extra precious time with them.
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pinbuster2005
Champion Author New Hampshire

Posts:5,503
Points:1,684,115
Joined:Oct 2005
Message Posted: Oct 26, 2014 12:08:14 AM

shockjock - Like I said read my whole post not just what you want to. I said my mileage is at it's best when I'm doing the Speed limits on those roads since my engine is at it's best mileage RPMs between 1500 and 2000. when I'm going faster the RPMs are over the 2000 mark thus reducing mileage.
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Shockjock1961
Champion Author Illinois

Posts:24,191
Points:2,865,940
Joined:Apr 2006
Message Posted: Oct 25, 2014 10:26:26 PM

" In other words driving 65 mph on the 55 mph speed limit roads and 75 mph on the 65 mph speed limit roads."

LOL!! So what if you are doing 65 mph in a 65 mph zone Pin? Does the mileage not drop simply because you are not speeding?
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Shockjock1961
Champion Author Illinois

Posts:24,191
Points:2,865,940
Joined:Apr 2006
Message Posted: Oct 25, 2014 10:24:56 PM

"ShockJ...., you believe that but once a car is in top gear, increasing speed requires more rpm and fights more wind resistance which both reduce mpg."

Most modern cars are geared so that the engine is most fuel efficient right around the speeds of 60 to 65 mph. Yes wind resistance increases exponentially, but at these speeds the efficiency of the engine far outweighs the resistance from the wind.

Now this is not true of all cars of course. My Prius gets slightly worse mileage at 65 then it does at 55, probably because the engine is kept right at it's most efficient operating RPM all the time with the CVT, so wind drag does become a factor, but with my other two vehicles (which don't have a CVT), the mileage is slightly better at 65 then it is at 55.

So speeding does not necessarily reduce gas mileage. Now if you are doing 80, or 90 mph, then of course all bets are off...
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