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

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Huntsville

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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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hooky
Champion Author Michigan

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Message Posted: Sep 18, 2013 7:44:44 AM

Yup!
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HotRod10
Champion Author Wyoming

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Message Posted: Sep 18, 2013 12:27:35 AM

"People that drive a lot...are the ones that are wasting their time,"

I think it depends on the reason you are driving those miles. If you have to get to work or lose your job, then I wouldn't consider that a waste. I don't consider taking my kids to spend time with their grandparents a waste either. I don't know anybody who drives just to drive, without going somewhere that's important to them.
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FrankLee1
All-Star Author Minnesota

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Message Posted: Sep 18, 2013 12:03:22 AM

People that drive a lot- no matter how fast- are the ones that are wasting their time, especially if they are the ones that equate time to money.
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HotRod10
Champion Author Wyoming

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Message Posted: Sep 17, 2013 9:46:35 AM

"Not a big deal that comes out $3.35/hr of free money in your pocket just by taking a few extra sec on the road."

It's only free if your time isn't worth anything, and it's $3.35/hr only if you get 5% better mileage at 65mph than you do at 75mph, which I don't.

"If an animal(like a deer) jumps out into the road (in this area you see a lot of deer) or if an accident happens by going that 10 mph slower it gives you more time to react possibly avoiding an accident or animal. Also if your going that 10 mph slower the impact if you do get into an accident is less and that could mean the difference in not being hurt, being hurt minorly, being hurt majorly, or dead."

Well, I consider those factors when I decide how fast to drive. On a rural interstate between here and Casper, in the middle of the day, where I can see half a mile in every direction and there are only 3 other cars in sight, the chances of encountering a large animal jumping out or an accident I didn't see, are pretty much zero. At night, on roads through the mountains or forested areas, poor road conditions, or heavier traffic, I drive at a speed reasonable for the conditions. I value my life above saving time, which is why I've never had so much as a fender bender in 27 years of driving (and I've driven a lot of miles in that 27 years), but I do value my time as well. If the conditions are suitable to go 80mph, I'm not driving an extra hour at 65 to save a couple of bucks.
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pinbuster2005
Champion Author New Hampshire

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Message Posted: Sep 17, 2013 1:28:18 AM

hotrod - "Not for a few minutes of time savings. If you gain that 5% mileage increase by slowing down from 75mph to 60mph, it will cost you over 66 hours over the year and 1.28 hours a week, meaning that you save about $2 for an extra hour on the road, or 3 cents a minute. Like I said, a few pennies for a few minutes. My time is worth more than $2 an hour."

Who said anything about doing 60 mph. If the posted speedlimit is 65 mph that is what I'm talking about. So by doing 65 mph your going to spend an extra 41 hours driving that comes out to 6 mins and 43 sec a day or 47 mins and 20 sec a week on the road. Not a big deal that comes out $3.35/hr of free money in your pocket just by taking a few extra sec on the road. But regardless of that there is one other factor your not looking at. If an animal(like a deer) jumps out into the road (in this area you see a lot of deer) or if an accident happens by going that 10 mph slower it gives you more time to react possibly avoiding an accident or animal. Also if your going that 10 mph slower the impact if you do get into an accident is less and that could mean the difference in not being hurt, being hurt minorly, being hurt majorly, or dead. I don't know about you but my life is worth a lot more than my time is. So if taking a few extra seconds on the road is going to be safer i'm fine with it plus it puts a few extra bucks in my pocket.

"First, some vehicles may see peak performance at 3500rpm (for most it's actually higher), but peak mileage typically occurs at a much lower rpm (around 2000). The good news is you're wrong about the speed for 3500 rpm also; most vehicles have taller gear ratios or overdrive, allowing them to keep the rpms around 2500 or below at highway speeds."

I'll agree with you there. For my buick mini van 65 mph is about 2000 rpms. Doing 55 mph on part of my drive is about 1500 rpms. It seams with that van it's peak performance is between 1500 - 2000 rpms. Which is what most mechanics have told me is normal peak milage areas.


[Edited by: pinbuster2005 at 9/17/2013 1:32:00 AM EST]
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gougedQC
Champion Author Montreal

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Message Posted: Sep 16, 2013 9:37:11 PM

rpm at 100kmh (roughly 50mph) varies greatly..in one of my vehicles with the red line over 7000 rpm...100 is closer to 3000 rpm...interesting as that was about the same rpm as my very old brit sportscar (if memory serves)

for my soccor mom US van...100km-60m is only about 2ooo rpm

However, as i value my time at about $40 hour...whatever teeny bit extra cost in gasoline for going a bit over the limit...is well worth it.
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HotRod10
Champion Author Wyoming

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Message Posted: Sep 16, 2013 11:24:37 AM

"20,000 miles a year...drive the posted speed limit and increase your mileage 5%...That's a savings of $137.16 a year or $2.64 a week."

Not for a few minutes of time savings. If you gain that 5% mileage increase by slowing down from 75mph to 60mph, it will cost you over 66 hours over the year and 1.28 hours a week, meaning that you save about $2 for an extra hour on the road, or 3 cents a minute. Like I said, a few pennies for a few minutes. My time is worth more than $2 an hour.

"Peak engine performance is 3500 RPM's for the regular car which would be about 65 mph. Beyond that you are throwing money away."

First, some vehicles may see peak performance at 3500rpm (for most it's actually higher), but peak mileage typically occurs at a much lower rpm (around 2000). The good news is you're wrong about the speed for 3500 rpm also; most vehicles have taller gear ratios or overdrive, allowing them to keep the rpms around 2500 or below at highway speeds.



[Edited by: HotRod10 at 9/16/2013 11:30:25 AM EST]
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kerberalt
Rookie Author Fort Worth

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Message Posted: Sep 14, 2013 2:45:46 AM

Peak engine performance is 3500 RPM's for the regular car which would be about 65 mph. Beyond that you are throwing money away.
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pinbuster2005
Champion Author New Hampshire

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Message Posted: Sep 14, 2013 2:30:51 AM

"Well, you got it right at the end - a few more minutes will save a few cents, not dollars."

I'm sorry but no your going to save dollars. If you drive 10-15 mph over the posted speed limit and get 25 mpg overall. In 20,000 miles a year that means you'll use 800 gallons of gas at an average of $3.60/gal that is a yearly cost of $2880. If you drive the posted speed limit and increase your mileage 5% that brings it up to 26.25 mpg. so for that same 20,000 miles you'll use 761.9 gallons at $3.60/gal gives you a cost of $2742.84. That's a savings of $137.16 a year or $2.64 a week. Sure it's not a lot but it's still better in my pocket than the gas stations. Someone like me that drives closer to 30,000 miles a year the savings is higher.

"On a rural interstate that would be true, but on an urban freeway, it just doesn't happen. The speed limit on I25 in Denver is 55, but you'd be more likely to get a ticket for impeding traffic going 55 than getting a speeding ticket for going 75 with everyone else. Going 75 is a lot safer too, so that's what I do; forget the posted limit and the 5% better mileage, safety is priority #1. "

That's because the posted speed limit isn't enforced like it should be. If the speed limit was enforced everyone would be doing the speed limit or with in 5 mph.

"Well, since you've never gotten a ticket that way, then they must work perfectly; all those reports of other people getting bogus tickets and the thousands of fines that have been refunded must just be a figment of somebody's imagination."

Hotrod if you bothered to read my whole post you would have seen that I said that there are cities, towns, & states that have had cameras set to give out bogus tickets but that can also happen when tickets are given out by live cops as well. It comes right down to how the elected officials in an area deside they want to do things. But if you follow the traffic laws your chances of getting a ticket are much lower. But also there are people that get tickets and even if they are in the wrong such as doing say 80 mph in a 65 zone they will fight it anyway just because others are doing the same thing and didn't get pulled over. The problem is that people want to blame something but themselves for what they do. Your the one in control of your automobile not the camera or the cop. Follow the traffic laws and you'll be better off in the long run.
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HotRod10
Champion Author Wyoming

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Message Posted: Sep 13, 2013 11:36:03 AM

"Take a few more minutes and save dollars.....also makes cents...."

Well, you got it right at the end - a few more minutes will save a few cents, not dollars.
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ggg452
Champion Author Manitoba

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Message Posted: Sep 13, 2013 11:18:04 AM

Take a few more minutes and save dollars.....also makes cents....
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HotRod10
Champion Author Wyoming

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Message Posted: Sep 13, 2013 11:05:11 AM

"I've been in many areas that use them and have NEVER gotten a ticket from them..."

Well, since you've never gotten a ticket that way, then they must work perfectly; all those reports of other people getting bogus tickets and the thousands of fines that have been refunded must just be a figment of somebody's imagination.

"We might think they are set too low but if you don't follow them and end up with a ticket you have no one to blame but yourself for having to pay a fine and have increased automobile insurance rates because of the ticket."

On a rural interstate that would be true, but on an urban freeway, it just doesn't happen. The speed limit on I25 in Denver is 55, but you'd be more likely to get a ticket for impeding traffic going 55 than getting a speeding ticket for going 75 with everyone else. Going 75 is a lot safer too, so that's what I do; forget the posted limit and the 5% better mileage, safety is priority #1.


[Edited by: HotRod10 at 9/13/2013 11:11:49 AM EST]
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pinbuster2005
Champion Author New Hampshire

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Message Posted: Sep 13, 2013 4:20:41 AM

Hotrod - Any city, town, or state for that matter can issue bogus tickets even with a cop issuing them it doesn't take a camera to do that. It all depends on what the elected officials tell the officers to do. People say the same thing about red light cameras and personally I've been in many areas that use them and have NEVER gotten a ticket from them because I'm not trying to beat the light and I stop behind the stop line like your supposed to. If you follow the traffic laws you should never have a problem with the cameras, cops, or anything else they want to set up.

"Mostly people speed because the speed limits are set too low for the roadway. I believe it was one of the cities in Indiana where they checked the average speed people were driving before and after they changed the speed limits; the average speed didn't change a bit. People will generally drive the speed they are comfortable with, regardless of the posted limit."

You can check the average speed of drivers all you want. There are factors that go into setting the speedlimits. I personally say if the speedlimit on a certain interstate is 65 mph then that is what you should be traveling not 75-80. We might think they are set too low but if you don't follow them and end up with a ticket you have no one to blame but yourself for having to pay a fine and have increased automobile insurance rates because of the ticket.

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skye1212
Champion Author Austin

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Message Posted: Sep 12, 2013 9:43:45 PM

air resistance increases exponentially.
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MTK143
Veteran Author Pittsburgh

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Message Posted: Sep 12, 2013 3:16:20 PM

to a certain point. then the cars aerodynamics work against it. Come one people this is basic physics
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HotRod10
Champion Author Wyoming

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Message Posted: Sep 12, 2013 1:20:49 PM

Think automated "speeding cameras" are a good idea? I think this guy would disagree:

Motionless Driver Gets Ticketed For Speeding
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dontuknowOH
Champion Author Ohio

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Message Posted: Sep 12, 2013 10:38:37 AM

Maybe a sign reading You can't run over the speed limit 20 times a week then complain about fuel prices. Yes you can it's call Lucky! Then there is Un-Lucky, and that isn't nice it's way more often, more than high fuel prices. Then select your own "Sweet Spot" speed Wow! that's bound to save, just watch your econo read-out.

If your vehicle doesn't have one It's like riding a bicycle then picking a constant speed where you are most comfortable pedaling for the long hall. Trial/error with the vehicle habits soon reveal at the pumps the outcome. My results show up there....Often the Wife says "remember how you drove last week! I do!" Kido! She's Wrong.......
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HotRod10
Champion Author Wyoming

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Message Posted: Sep 12, 2013 10:38:05 AM

"I personally think people speed because the speedlimits aren't enforced the way they should be."

Mostly people speed because the speed limits are set too low for the roadway. I believe it was one of the cities in Indiana where they checked the average speed people were driving before and after they changed the speed limits; the average speed didn't change a bit. People will generally drive the speed they are comfortable with, regardless of the posted limit.

"I agree with giving a 5 mph leeway for the reason of a speedometer might be off slightly, topping a hill, just finished passing someone, or even the radar being slightly off."

Yes, most speedometers are off at least a little bit: "Dan Edmunds, an automotive engineer and the director of vehicle testing at Edmunds.com, says that speedometers cannot have an error of more than 5 percent (typically expressed as plus/minus 2.5 percent relative to the actual speed) according to federal law."

Topping a hill is no excuse for exceeding the speed limit; however, Wyoming just passed a law allowing a driver to exceed the speed limit when passing (only on 2-lane roads, of course).

Radar can be way off, especially if it hasn't been calibrated recently.



[Edited by: HotRod10 at 9/12/2013 10:43:38 AM EST]
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pinbuster2005
Champion Author New Hampshire

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Message Posted: Sep 12, 2013 1:50:19 AM

I personally think people speed because the speedlimits aren't enforced the way they should be. People can say if you raise the speedlimit you cut down the amount of speeders there are but that is a crock. I've been in parts of the country that have a 75 mph speedlimit on the interstate and people still buzz by you like your hooked to the guardrail if your doing the posted speedlimit. What we need is to enforce the speedlimits that we currently have along with other traffic laws that seem to be lacking in enforcement. But as far as speeding goes I agree with giving a 5 mph leeway for the reason of a speedometer might be off slightly, topping a hill, just finished passing someone, or even the radar being slightly off. but after that people need to get tickets by either a live cop or even sent to them with a speedlimit camera. I know how against cameras people are but if your following the traffic laws even cameras aren't going to cause you to get a ticket.
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Camry05
All-Star Author Indiana

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Message Posted: Sep 11, 2013 1:08:55 AM

Yes, speeding reduces gas mileage, but if u can control the car and know ur limits and the car's limits, you should be fine
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HotRod10
Champion Author Wyoming

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Message Posted: Sep 10, 2013 11:34:13 AM

"speed doesn't kill at all...stupidity kills, incompetence kills."

Exactly right. It doesn't matter how fast you go, as long as you stay on the road in an upright position and don't hit anything. Speed in excess of the capabilities of the driver or vehicle, or where the visibility or conditions do not allow sufficient distance or time to safely avoid obstacles, that's what kills.

"the road conditions vary and yet the limit is --as far as I know- state wide regardless of the varying conditions.."

I don't know a lot about other areas of the country, but our roads have been maintained in acceptable condition for the posted limit, at least so far. Along Interstate 80, last year they instituted variable speed limits in several areas that are subject to poor weather conditions. When there's heavy snow, ice or fog, the speed limit signs can be changed remotely to reduce the speed limit. So far, it seems to be working very well; crashes in those areas are way down from previous years.
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Zennyboy
Veteran Author Toronto

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Message Posted: Sep 10, 2013 11:17:09 AM

n
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dontuknowOH
Champion Author Ohio

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Message Posted: Sep 10, 2013 9:58:04 AM

I just think of driving at higher speed as similar to turning on the garden hose, the more you desire to spray the water quicker with larger amounts, then equals the amount you compress the spray nozzle to the maximum.

Engines have a RPM range, and being variable performing = controlled by the go-pedal at least every vehicle I've owned worked that way. Engines breath in air/fuel as energy = power to perform more/less for a given amount of run-time(duration)= fuel consumption.

Then too wind has an affect on water sprayed or effects concerning any vehicle movement costs. Saying playing with the garden water hose or the automotive go-pedal gets costly but one is much greater.
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gougedQC
Champion Author Montreal

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Message Posted: Sep 9, 2013 6:10:06 PM

HOTROD-ok, but then--a question-- highways vary througout a state, and here in Canada its pretty much 100km/h across most of the country,(although on the major 400 series higways in Ontario..120 seems to be allowed and 140 is not uncommon) and in both cases the road conditions vary and yet the limit is --as far as I know- state wide regardless of the varying conditions..

BOYRR- speed doesn't kill at all.. if it did, we wouldnt have road races, rallys, roundy round nascar (yawn) etc

people kill themselves and others at very low speeds too...stupidity kills, incompetence kills.
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fatso
Veteran Author Indianapolis

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Message Posted: Sep 9, 2013 4:23:55 PM

YES
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HotRod10
Champion Author Wyoming

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Message Posted: Sep 9, 2013 9:48:52 AM

"hotrod- your thoughts on why some limits vary on some highways..ie vegetation tight turns etc...is an interesting theory but has no basis in fact."

It's a fact for the state highways here in WY. I know the highway designers; I work with them regularly. Sight distance, clear zone width, shoulder width, etc. are all accounted for based on the criteria in the AASHTO "green book" when setting the design speed and the speed limit for each stretch of highway. Cities set speed limits on their streets, unless it's also a state highway, and sometimes those are based on political considerations, including generating revenue.

[Edited by: HotRod10 at 9/9/2013 9:51:24 AM EST]
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pt1KY
Champion Author Lexington

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Message Posted: Sep 8, 2013 9:36:44 AM

That's a given!
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dontuknowOH
Champion Author Ohio

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Message Posted: Sep 8, 2013 9:26:39 AM

Just speaking for my area, we have tricky state approved signs. Like no right turn on red during school hours. That could be interpreted as only during those hours of walking to school, school bell signals that sessions have started/ended. or busses are operating for transport, maybe do you see any children in the area of the intersection light walking.

Then what about Saturdays/Sundays when no school is in session ,concerning only the hours spelled out> "During School Hours" Evasive logic at it's best...... Cruisers hiding behind bushes, signs , or anywhere for driver entrapment is good for the movie scenes only.

Sometimes just plain old logic can get you a ticket or not, really the stretch word (DEPENDS) "Depends" seems nice for a bit of fuel saved from not idling away, rather going for it, the Logic Thing'ee!

There are a lot of signs that refer to what one should be doing that deem practicable for the conditions awaiting your presence/others but not for saving fuel, seems so....! HABetter Day....
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Boyrr
Champion Author Allentown

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Message Posted: Sep 7, 2013 7:24:22 PM

Speed kills
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gougedQC
Champion Author Montreal

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Message Posted: Sep 7, 2013 7:48:06 AM

hotrod- your thoughts on why some limits vary on some highways..ie vegetation tight turns etc...is an interesting theory but has no basis in fact.

there are minimum and maximum standards for highways in N Am (and Europe) in regards to gradients and turn degrees/distance/banking

besides politicians don't think in "logic" which is the basis for you thought..they think often in how much money a stretch of highway can generate.

Question: if the police wanted to slow people down, wouldn't they park out in the open, easily visible?
If they were ordered to collect funds wouldnt they hide behind objects with their rader guns and "trap" people?
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HotRod10
Champion Author Wyoming

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Message Posted: Sep 4, 2013 2:04:37 PM

"hot rod..its not about safety either..if it was you wouldnt have such a wide variation of speeds.

I get a kick out of some who say 65 is speeding and therefore unsafe, when the next state over its 75...and "safe"."

Meddling politicians aside, there are valid reasons for different speed limits in different areas. Speed limits should be based on the road design, road condition, sight distances, clear zone width, etc., and usually are. Roads where there is high vegetation close to the roadway, sharp curves with out adequate superelevation (banking), etc. should have lower limits than an interstate crossing the prairie.

This is the problem with the OP; speed limits vary widely. Where the speed limit is 40 mph, speeding will actually increase your mileage in almost all vehicles, while you can be be well above your optimum mileage and still below a 75 mph speed limit.

For me, safety is the first priority, minimizing windshield time is second, and saving a few bucks in gas a distant third.
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Camry05
All-Star Author Indiana

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Message Posted: Sep 2, 2013 12:30:43 AM

We speed bcos its a high
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dvc2
Champion Author Oakland

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Message Posted: Sep 1, 2013 6:09:31 PM

You would save gas at 60 mph as opposed to driving 75 mph, but it wouldn't be anywhere near 50% you claim.
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pezbep
All-Star Author Miami

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Message Posted: Sep 1, 2013 11:41:49 AM

very much so
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dontuknowOH
Champion Author Ohio

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Message Posted: Sep 1, 2013 9:42:23 AM

I think that speeding is all about a matter of being spoiled, spoiled with convenience, affordable for some, and not so for others. History has evidence from the first of time that man walked everywhere... then the restful ideas came along with the help of animals and now look at all the ways the modern man goes to where he chooses (6-8 speed vehicle transmissions)Ha...! that's hard to believe.

I have a hard time thinking about man walking everywhere back then, in America, before most every car was painted necessary black(color). Those vehicles couldn't speed, only to go downhill. Seems it took drivers over 110 years give/take to get bored with sitting in the drivers seat of a fuel powered vehicle, and how long to be dissatisfied about that basic Black car color...... or gas mileage V/S the time factor to arrive somewhere? I'm spoiled every time I mow grass, that's so easy today! Easy after a Cold One!
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MertieMan
Champion Author Lexington

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Message Posted: Sep 1, 2013 8:32:11 AM

Almost six years and this thread is still around, LOCK IT!
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Banjoe
Champion Author Winnipeg

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Message Posted: Sep 1, 2013 7:49:50 AM

Lower prices, reduced usage, better efficiency.....not many more options here.

I don't think anyone denies that speeding decreases fuel efficiency (well, maybe a few fringe players and bless them for that). I think it becomes a matter of what's my time worth to be sitting in this vehicle. There are places to go and things to do - sitting here with a steering wheel just isn't a favorite pastime for many people.
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contiki
Champion Author Ontario

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Message Posted: Sep 1, 2013 7:47:54 AM

Everyone knows that speeding reduces gas mileage....nothing new here...
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StArrow68
Champion Author Oakland

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Message Posted: Sep 1, 2013 7:25:53 AM

There are just days when getting home is worth a few pennies extra.
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MTK143
Veteran Author Pittsburgh

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Message Posted: Aug 31, 2013 6:34:54 PM

to a point it all depends on aerodynamics and road surface
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LarryMarg
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Message Posted: Aug 31, 2013 12:45:42 PM

"I'd rather spend less to fill up my tank" is a different topic than "I'd rather get better gas mileage".

While slowing down may improve mileage, it can also make your trip take longer. So it depends on what your priorities are - and that may differ per journey.

And I think my 6-speed does better at highway speeds than my 3-speed did 35 years ago...
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dontuknowOH
Champion Author Ohio

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Message Posted: Aug 31, 2013 9:38:11 AM

Just a few days ago a country friend,(pumpkin grower) mentioned he had seen the Amish greasing his buggy axle/wheels with lard/fat/molasses in order to save the cost of foreign oil products.

My friend asked "doing that for speed" He replied "speed"? I never get involved with that "nervous stuff"......
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Boyrr
Champion Author Allentown

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Message Posted: Aug 30, 2013 3:47:38 PM

That's news to me.
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smugutu1234
Champion Author Tallahassee

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Message Posted: Aug 29, 2013 11:46:38 AM

Really?
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ggg452
Champion Author Manitoba

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Message Posted: Aug 29, 2013 10:37:15 AM

I agree, slow down and not only live but save money too...get there 15 minutes later but keep that cash in your pockets....
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Shockjock1961
Champion Author Illinois

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Message Posted: Aug 29, 2013 10:30:47 AM

"Gas is such a small portion of a normal person's budget that it doesn't matter!"

Then why are people constantly complaining about the price?
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Vin63
Champion Author San Bernardino

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Message Posted: Aug 29, 2013 10:20:54 AM

Vin63.
Your over thinking what your saying, and Your Statement is WRONG.
"The reduction in fuel mileage as a result of speeding is dependent upon the velocity and the coefficient of drag for your particular vehicle."
Mythbusters Proved a few years ago that a car that has Golf Ball Dimples in it has LESS DRAG and get BETTER FUEL ECONOMY.

Valandingham - since it appears you have some cognitive disabilities, my statement that you quoted above addresses the coefficient of drag component that you refer to in the example of Mythbusters. Since not all cars are shaped alike, different cars will have different levels of drag/wind resistance. As a result some cars will have better fuel economy at higher speeds than other cars that are less aerodynamic.
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hooky
Champion Author Michigan

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Points:2,740,745
Joined:Sep 2005
Message Posted: Aug 29, 2013 7:53:15 AM

Gas is such a small portion of a normal person's budget that it doesn't matter! Next case!
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Zennyboy
Veteran Author Toronto

Posts:260
Points:79,480
Joined:Jul 2013
Message Posted: Aug 28, 2013 11:22:31 PM

not at all
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gougedQC
Champion Author Montreal

Posts:5,580
Points:75,965
Joined:Apr 2008
Message Posted: Aug 28, 2013 7:22:35 PM

hot rod..its not about safety either..if it was you wouldnt have such a wide variation of speeds.

I get a kick out of some who say 65 is speeding and therefore unsafe, when the next state over its 75...and "safe".
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