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Author Topic: Speed limits and mileage Back to Topics
tattoo666TX

Champion Author
Texas

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Message Posted: Feb 18, 2012 11:13:18 PM

So I noticed today that I-45 in Walker County (Huntsville Texas area) has a new speed limit posted. 75 mph, up from 70 mph. Personally I was only drive 60-65 mph when it was 70 because I was getting much better fuel mileage. Now unless I am in a big rush for some reason I will probably still run between 60 & 65 mph when I drive through there. I actually think the speed limits getting raised to 75 and 80 in parts of Texas is just another way for the government to get more tax dollars at the fuel pump, knowing people will be getting much lower fuel mileage at higher speed. SO how many people other then myself are planning on "NOT" doing the higher posted speed in preference of higher fuel mileage?
REPLIES (newest first) Topic is locked
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fharri7196
Sophomore Author Miami

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Message Posted: May 14, 2013 5:54:23 PM

yes
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PhilnTX
All-Star Author Dallas

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Message Posted: May 14, 2013 3:52:21 PM

Not me
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51stovi
All-Star Author Nashville

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Message Posted: May 14, 2013 7:32:31 AM

I will continue to drive 5-7 miles over the speed limit or whatever the law enforcement will typically let me get away with without a ticket.
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MertieMan
Champion Author Lexington

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Message Posted: May 14, 2013 5:05:59 AM

Most cars on the road now have overdrive and cruise control, thus allowing them to travel at a higher rate of speed with the same milage results.
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eyegotgas2
Champion Author British Columbia

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Message Posted: May 14, 2013 3:58:39 AM

Driving at slow speeds can be just as dangerous as speeding. You get long line ups of traffic and others eventually start passing at bad times.

You will also see several vehicles trying to pull out and pass at the same time.

It is a scary situation and I see it happen all the time.

If you are going to drive slow, pull over and let others pass.
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IAMCANADIAN73
Champion Author Ontario

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Message Posted: May 14, 2013 12:42:36 AM

Yes
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Houckster
Champion Author Atlanta

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Message Posted: May 13, 2013 2:03:44 PM

GRUMPYCAT writes: Remember speed DOES NOT kill. Only a DIFFERENCE in speed kills.
_____
Sorry but that's just not true. Speed does kill because it CREATES speed differentials and the faster you drive the the less response time you have to avoid an accident and the less time people have to see you.

I've seen a number of times when someone is doing 85 in the passing lane and another driver is stuck behind slower traffic. He checks his rear view mirror and left side mirror, no one's there so he gets ready to change lanes and suddenly there's a car there blaring horn and all. And to top it all, the bozo going 85 thinks the near-collision was the other guy's fault.

People who want to drive over the speed limit are selfish and irresponsible. They endanger other peoples lives, not just their own and I fully support the "Super Speeder" laws in my state and anywhere else they exist.

As for the states raising the speed limit to get more fuel tax money, that's probably not true either. What may be more accurate is that what we have is the state recognizing that people are driving that speed anyway and there is probably a lot of political pressure from constituents to raise the limit.

[Edited by: Houckster at 5/13/2013 2:07:52 PM EST]
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63pioneer
Champion Author Texas

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Message Posted: May 13, 2013 5:27:06 AM

They also raised the speed limit up to 75 mph from the south Grimes Co. line north thru Bryan/College Station and northward. I'm still going to drive 55 mph as I have been because I get a lot better mileage and it's less stressful. People can't drive safely at 55 mph, much less than at 70+ mph. If it was just you on the road it would be safer for you, but there are far too many folks who are impaired by whatever when they drive, and they cause the accidents that kill a lot of innocent folks, and don't even get me taking about drunk driving. They don't take their licences away soon enough and don't put anywhere enough of them in prison for long enough term. You kill someone while your drunk, you go to prison and maybe you'll get to drive a tractor in the fields. Drink if you want, but don't even get behind the wheel of a car or any other vehicle!
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krazkar
Champion Author Calgary

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Message Posted: May 12, 2013 11:54:31 AM

I don't care about the fuel economy. I will drive as fast as I am comfortable with. Higher speed limits in the States are great!
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Banjoe
Champion Author Winnipeg

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Message Posted: May 22, 2012 8:12:15 AM

I tend to run under the high speed limits for fuel econonmy but I'm seeing a lot of discussion here turning to road safety. I recall the days of 55mph limits on Interstates and those were dangerous times. The slow speeds made for very long days to get anywhere, so we were travelling with tired and bored drivers at low speeds on highways designed for 50% higher rates of speed. The lower speeds meant longer times on the road so higher traffic density on inattentive, mind numbed drivers deailing with loads of crazy-bored kids & dogs.

Fun times but we saved energy when the world ran out of oil the first time.
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red_green17
Champion Author Ottawa

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Message Posted: May 22, 2012 8:11:19 AM

Wish that was around here. Everyone here wants to lower the speed limits, especially residential.
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bithehr
Champion Author Atlanta

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Message Posted: May 22, 2012 7:42:07 AM

had not seen 75 mph in NC SC GA 70 is max in noncities
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Kras
Rookie Author San Diego

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Message Posted: May 21, 2012 4:37:14 PM

In California they can ticket you of your slow speed causes an unsafe roadway hazard.
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HotRod10
Champion Author Wyoming

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Message Posted: May 21, 2012 1:46:21 PM

"You will only get ticketed for driving slow in the left lane."

That's not true everywhere. Some places impeding traffic, even in the right lane, will get you a ticket; if it doesn't get you sent to the hospital first, and you may still get a ticket. Impeding traffic or being a hazard also trumps the speed limit some places.

You are right on how dangerous a speed differential can be, GrumpyCat. Our traffic engineers have said so, right on TV. There was some public pressure to reduce the interstate speed limits for trucks here in WY, and the experts said it would be more dangerous. We did get variable speed limits for several mountain passes, so they can reduce the limit for everyone during bad weather. That seems to be very successful so far.

[Edited by: HotRod10 at 5/21/2012 1:51:45 PM EST]
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GrumpyCat
Champion Author Alabama

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Message Posted: May 21, 2012 11:27:28 AM

"I'm pretty sure the only places where you would get a ticket for going 62 in a 75 zone would be on a busy urban freeway where going even the limit will likely get you run over and cause a pileup."

You will only get ticketed for driving slow in the left lane. You can get ticketed for driving slow in the left lane if you drive exactly the speed limit but are forcing others to pass you on the right.

"Slow Traffic Keep Right" trumps the speed limit.

Remember speed DOES NOT kill. Only a DIFFERENCE in speed kills. By driving slower than the prevailing traffic you are every bit as much of a hazard as those who are driving faster than the prevailing speed.
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tattoo666TX
Champion Author Texas

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Message Posted: May 21, 2012 10:58:00 AM

I can get out here where it is posted 70 mph "MAX" and set the cruise between 55 and 60, stay in the right lane and get better mileage all the time. Cops will noty stop or ticket me for that speed being too slow. I think it is 45 mph minimum on the interstate and U.S. highways.
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rick_evans
Champion Author Boston

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Message Posted: May 21, 2012 10:24:52 AM

"2004-2007 Toyota claimed 60 mpg city/51 mpg highway later in 2008 it was changed to 48 mpg city/45 mpg highway still higher than we get. "

Those are NOT Toyota claims.

Those are EPA estimates which Toyota can use in its advertising. The revised numbers are again EPA numbers. All brands had their numbers revised. Why make misleading statements? And, all EPA numbers carry the "Your mileage may vary" caveat.

I routinely get better than the EPA 37 MPG highway mileage on my Corolla CE. Last long trip I got 41 MPG.
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TheRavenHeart
Veteran Author Chattanooga

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Message Posted: May 18, 2012 9:46:47 AM

I just want to get one of those magnetic signs realtors put on there car doors so that when people pass me on the interstate, they can see "By doing 60 MPH, I'm getting 120 more miles out of a tank of fuel then you are"
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HotRod10
Champion Author Wyoming

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Message Posted: May 16, 2012 12:51:05 PM

"We set the cruise between 62 and 64 mph..."

"Watch doing that because you can get pulled over for driving too far under the speedlimit as well as exceeding the speedlimit."

I'm pretty sure the only places where you would get a ticket for going 62 in a 75 zone would be on a busy urban freeway where going even the limit will likely get you run over and cause a pileup. On a rural interstate, especially in the mountain west, people drive as slow as 55mph on the 75mph interstates all the time, including many of the trucks. Going up the mountain passes, some of the trucks only manage 10mph.

"Less than a handful of States have raised the Minimum Speed to 45 MPH."

On I25 north of Denver, CO it's 55mph minimum in the left one of the 3 lanes only.
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KansasGunman
Champion Author Kansas

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Message Posted: May 16, 2012 9:36:35 AM

"Watch doing that because you can get pulled over for driving too far under the speed limit as well as exceeding the speed limit."

.....

The overall majority of States Interstates have a posted Minimum speed limit at 40 MPH and the posted signs are directly under the posted Limit.

Less than a handful of States have raised the Minimum Speed to 45 MPH.

Whether people think the posted limits are too low or not is a moot point...the law is the law and as we travel extensively we see a whole lot more people slowing down and driving within the limits as the price of fuel has gone up...whoa, do you suppose they're finally getting it?
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GBHUGVA
Champion Author Virginia Beach

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Message Posted: May 16, 2012 8:58:50 AM

"Honda like Toyota lies about MPG's, The wifes Prius got 40.3(395miles on 9.8gal) last fill NOT the 60/51 Toyota claims."

2004-2007 Toyota claimed 60 mpg city/51 mpg highway later in 2008 it was changed to 48 mpg city/45 mpg highway still higher than we get.

Our 2005 Ford Escape Hybrid gets 32.5 most of the time, paid 10grand
the wifes P.O.S. 2004 prius only gets 40.3 not 60 like they said, but she got it for 7grand, ok beater I guess, but the Ford is our favorite, better quality for sure!

reb4, that driving 30-40mph in 45-55limit roads will get you rear-ended, oh maybe your into that kinda thing!
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the1roadhog
Champion Author Atlanta

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Message Posted: May 16, 2012 7:56:54 AM

Take your chances at whatever posted limit.
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bustermoves
Champion Author Fort Worth

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Message Posted: May 16, 2012 5:38:52 AM

on most of the freeways here in dfw,the speed limit is 60.typically i run 65-70,and people pass me like im sitting still.
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pinbuster2005
Champion Author New Hampshire

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Message Posted: May 16, 2012 3:39:04 AM

kansasgunman - "The speed limit on the Kansas Interstate is 75, will we follow it...absolutely not, never have and never will.

We set the cruise between 62 and 64 mph on all vehicles and enjoy the trip."

Watch doing that because you can get pulled over for driving too far under the speedlimit as well as exceeding the speedlimit.

"Keep in mind the meaning of the word "limit"...for the ones of lower mentality who haven't yet learned to read; the basic definition is "the maximum not to be exceeded" which is never to be inferred as the "a starting point"

The problem is that there are a lot of people that think the speedlimits are set too low so they do 10-20 mph over them no matter what they are.

"I love it when I see a car pulled over by a state Trooper that had flown by us and nearly blowing our doors off...makes my day."

There is the problem right there is that speedlimits aren't enforced enough. Personally I say give people a 5 mph leway and that is fine but if they are doing 10-20 mph over the posted speedlimit they should get a ticket because they are indeed breaking the law. If the police can't catch these speeders on their own then it's time speed cameras were put up and nail these people. Maybe if the traffic laws were enforced like they should be there would be less accidents on our highways and if that happened maybe automobile insurance rate would go down as well.
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butcherc
Champion Author Florida

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Message Posted: May 9, 2012 5:14:42 PM

about 60-65 gives me the best mileage
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rick_evans
Champion Author Boston

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Message Posted: May 9, 2012 2:59:42 PM

They might raise more revenue by lowering the speed limit and putting in speed cameras. :))
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BUSSY
Champion Author Dallas

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Message Posted: May 5, 2012 7:13:32 AM

If you don't drive the speed limit then please do not be one of the clowns who drives in the left (passing lane).
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W707
Champion Author Pennsylvania

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Message Posted: May 5, 2012 4:36:26 AM

the speed limit in PA is 65 mph i drive about 5mph under it if conditions allow it.
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KansasGunman
Champion Author Kansas

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Message Posted: May 4, 2012 1:31:37 PM

The speed limit on the Kansas Interstate is 75, will we follow it...absolutely not, never have and never will.

We set the cruise between 62 and 64 mph on all vehicles and enjoy the trip.

Keep in mind the meaning of the word "limit"...for the ones of lower mentality who haven't yet learned to read; the basic definition is "the maximum not to be exceeded" which is never to be inferred as the "a starting point"

I love it when I see a car pulled over by a state Trooper that had flown by us and nearly blowing our doors off...makes my day.

[Edited by: KansasGunman at 5/4/2012 1:32:12 PM EST]
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PatAZ
Champion Author Tucson

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Message Posted: May 4, 2012 9:41:49 AM

Not me.
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diesdown
Champion Author North Carolina

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Message Posted: Apr 29, 2012 7:31:14 PM

SO how many people other then myself are planning on "NOT" doing the higher posted speed in preference of higher fuel mileage?
-------------------------------------------------------------
Me!
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tnikodem
Champion Author Grand Rapids

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Message Posted: Apr 29, 2012 1:59:41 PM

Hello tattoo666TX: Too often, guidance on speeds comes from people and organizations based in NYC, Chicago area, Los Angeles, or worst of all the Washington DC area.

They seem to have no idea of the distances driven across Texas, across Nebraska, across Montana, or across Saskatchewan. In the cities listed, a 70 mph speed could be deadly on a 20 mile trip around the edges of town. Conversely, added driving time at slower speeds in the open country could let to more fatigue and more danger.

We need to set speed limits appropriately. Too fast may lead to speed related accidents. Too slow may lead to accidents caused by all the people who want to go with the flow of traffic and not the posted limit..

Michigan has a unique method for setting speed limits. They measure the speed car are traveling on a stretch of road and the set the speed limit so 85% are within the revised limit. It makes the flow of traffic an important factor. It also stops many unreasonable speed traps established by small rural communities.
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Titanic1985
Champion Author South Carolina

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Message Posted: Apr 29, 2012 11:56:37 AM

Hello tattoo666TX. You don't state what vehicle you are driving, but it sounds a great deal like my 2008 Chevrolet Equinox LS. It has a 3.4L six cylinder engine, a 5-Speed automatic and weighs 3,400 lbs. The speed limit in South Carolina (away from cities) is 70 MPH. At 70 MPH, my vehicle runs at 2,000 RPMs while at 65 MPH the RPMs drop 300-400. This equates to a .5 mile per gallon savings as computed by my vehicle and a calculator. I average around home 24.7 MPG and on a straight highway run up to 28.3 with the air-conditioner running. That is better than many smaller vehicles.

Another friend in WY has a 2004 Saturn Vue. His vehicle exhibits the opposite behavior. The higher the speed, the better the gas mileage. His problem is that the higher speed exceeds the 75 MPH limit.

He and I both take excellent care of our vehicles and it appears that the gearing is different since all other factors are nearly the same (e.g. engine size, transmission, etc).

Your final statement does cause me a problem. I've driven over two million miles, much of it in company owned vehicles and places like Texas are legitimatly increasing speed limits for people who need to get where they are going. In business time is money. If it is safe to drive at those speeds and you are comfortable of your skills, then it lawful to do so. That said, you don't have to.
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Jescareno22
Veteran Author Toms River

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Message Posted: Apr 21, 2012 11:44:09 PM

.
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HotRod10
Champion Author Wyoming

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Message Posted: Apr 16, 2012 4:33:56 PM

reb - "That does not invalidate my statement."

I wasn't trying to argue with your statement about speed limits not affecting speed; I was just pointing out that the other arguments for lower speed limits don't really hold water either.

reb - "So something else changed in the way that people were driving during the "reasonable and prudent" period to explain the lower fatalities. The speed factor is not in the equation. Some factors that have been suggested include:
increased lane courtesy
increased seat belt use
less speed fluctuation"

If it was only before or after that period that fatalities were lower, I might buy those explanations, but I doubt lane courtesy and seat belt usage increased during the "reasonable and prudent" time and decreased afterwards. The last one I might buy into if it was "less speed differential", since that is the factor that has been documented to reduce accidents.

Me - "Fuel mileage depends on more factors than just speed, and some vehicles do get better mileage at increases of 5mph and even 10mph within certain ranges."

reb - "I've been looking for something to back this up and have failed. Help me out here."

I don't have any scientific studies that prove it; I only have anecdotal evidence from numerous posters in the forums here, as well as my own experience to back that up. The theoretical backing for it is based on efficiency of an ICE at various rpms (engines are most efficient within a certain rpm range) and what's called Drag crisis where the air drag takes a significant dip at the right combination of size, shape, and speed when the boundary layer of a fluid (in this case air) begins to become disrupted, or turbulent, instead of smooth, or laminar, as it goes around an object.
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reb01501
Sophomore Author Worcester

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Message Posted: Apr 16, 2012 2:37:12 PM

>
"Driving slower does reduce fuel use and accidents,"

Actually, even those arguments are neither one true.

Fuel mileage depends on more factors than just speed, and some vehicles do get better mileage at increases of 5mph and even 10mph within certain ranges.
>

I've been looking for something to back this up and have failed. Help me out here. Are you talking about the difference between, say, 25 mph and 35 mph? Yes, the mileage would likely be better at 35 mph, but I don't think that's relevant to this particular discussion.

>
Crunching the numbers from Montana before, during, and after the period when they abolished the set speed limit, shows that highway fatalities were lower during the "reasonable and prudent" limit (and the 6 months after that was thrown out, when there were no limits whatsoever) than with 75mph limits before or after.
>
That does not invalidate my statement. All you've done is show that eliminating _limits_ reduced fatalities. The actual speeds people were driving did not change: "The measured vehicle speeds only changed a few miles per hour as predicted " (http://www.motorists.org/press/montana-no-speed-limit-safety-paradox)

So something else changed in the way that people were driving during the "reasonable and prudent" period to explain the lower fatalities. The speed factor is not in the equation. Some factors that have been suggested include:
increased lane courtesy
increased seat belt use
less speed fluctuation
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HotRod10
Champion Author Wyoming

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Message Posted: Apr 16, 2012 2:01:05 PM

"Driving slower does reduce fuel use and accidents,"

Actually, even those arguments are neither one true.

Fuel mileage depends on more factors than just speed, and some vehicles do get better mileage at increases of 5mph and even 10mph within certain ranges.

Crunching the numbers from Montana before, during, and after the period when they abolished the set speed limit, shows that highway fatalities were lower during the "reasonable and prudent" limit (and the 6 months after that was thrown out, when there were no limits whatsoever) than with 75mph limits before or after.
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JCLNC
All-Star Author Greensboro

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Message Posted: Apr 14, 2012 5:52:06 AM

I agree. Driving at higher limits just uses more gas. Who can afford that.
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carinthuist
Champion Author San Francisco

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Message Posted: Apr 13, 2012 1:24:34 PM

speed limit and mileage I DROVE TO SACARMENTO over the weeekend at 60 mph in a hhr car and to my amazement got 32 mpg from san francisco to sacramento.
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reb01501
Sophomore Author Worcester

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Message Posted: Apr 13, 2012 12:29:04 PM

> Why do we need speed limits so high, it only cost more money and accidents.

That has been disproven.
Driving slower does reduce fuel use and accidents, but speed limits have had little effect on how fast most people drive. Speed limits are primarily a means of raising money.

"For example, an 18-month study following an increase in the speed limit along the New York Thruway from 55 to 65 mph, determined that the average speed of traffic, 68 mph, remained the same. Even a national study conducted by Federal Highway Administration also concluded that raising or lowering the speed limit had practically no effect on actual travel speeds."

"Traffic engineers have repeatedly rediscovered that the best way to set speed limits is to measure the free-flowing speeds of traffic and determine the 85th percentile speed, which is the speed at which 85 percent of the vehicles are traveling at or below"

Speed limits set lower than the 85 percentile speed for a road have the sole result of increasing speeding tickets issued and money flowing into courts - they do not make people slow down. Yeah, a person who gets a ticket might slow down for a while but for the most part, the feeling of invincibility returns and the speed creeps up again.

http://www.motorists.org/speed-limits/studies
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graceman
Champion Author Baltimore

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Message Posted: Apr 12, 2012 11:28:15 PM

Why do we need speed limits so high, it only cost more money and accidents.
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HotRod10
Champion Author Wyoming

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Message Posted: Apr 12, 2012 8:00:26 PM

Pinbuster - "But if you happen to get pulled over for speeding and get a ticket...would your time still be worth more than your saving?

Again, I'm not going to get a ticket for going 75mph if that's the speed limit.

Pinbuster - "If your driving 65 mph and getting 50 mpg and you drive say 100 miles. It will take you 1 hour and 32 mins to drive it and use 2 gallons of gas. Ok if your doing 75 mph and get 45 mpg that same trip will take you 1 hour and 20 min and you'll use 2.22 gallons of gas. So by doing 10 mph over the speedlimit you will save 12 min of time but by doing the speedlimit you will save .22 gallons of gas. Ok at $3.50/gal that comes out to a savings of 77 cents. so that would come out to $3.85/hr just for the gas savings. for 12 mins of your time."

I don't get 50mpg at 65mph, I get about 48mpg. I get 50mpg at 60mph. Try running those numbers again and you'll discover I do indeed know how to do math too. At $3.50/gal, I get $2.33/hour and at $4.00/gal I get $2.67/hour, still significantly less than $3.00/hour.

For others who may be are interested it's: (mpg1 - mpg2) / (mpg1 X mpg2) divided by (mph2 - mph1) / (mph1 X mph2) multiplied by price per gallon.
For my example: (50-45)/(50X45)/[(75-60)/(75X60)] X $3.50 = (5/2250)/(15/4500)X 3.5 = .0022 / .0033 X $3.50 = $2.33/hour


Pinbuster - "But let's look at other factors when going faster especially reaction time if something happens in front of you. The faster you go the more space you need to brake safely."

I anticipate potential hazards and drive accordingly, as everyone should. I never said I always drive 75mph; I do when the conditions and visibility are favorable and adjust my speed when they're not.
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jamieg2012
Veteran Author Sioux Falls

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Message Posted: Apr 10, 2012 1:45:24 AM

some of the people driving through town at interstate speeds and think they are saving gas really do not figure in the cost of the speeding tickets and higher insurance and the accidents they cause in their little save money math

if you add in all of that you actually spend more doing interstate speeds through the middle of town
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cheap2010skate
Champion Author Tampa

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Message Posted: Apr 8, 2012 11:27:41 AM

On weekends, when I have no crucial appointments, I like to take my time and drive 65 mph in 70 speed limits. I did this last weekend on a highway (driving the slow lane) and every single car passed me. Everyone else was going 75 to 85 mph. It did not bother me at all. Let the speeders go.
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shadow6191
Champion Author Albany

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Message Posted: Apr 8, 2012 9:34:18 AM

.
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jimmy544
Champion Author Boston

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Message Posted: Apr 8, 2012 9:00:51 AM

I wondered about that too. I have driven to and from and through Texas several times in the last 15 years. The section of I-10 from the New Mexico line to 40-50 miles from San Antonio is posted at 80 or was the last time I went through in 2010. I checked the mileage and my Volvo gets about 23 mpg at 80 mph. This car gets about 26-27 mpg at 70 mph but it gets 30 mpg at 62 mph.

I have a Buick that gets about 30 mpg at 70 but it gets 27-28 mpg at 75. I have not driven this car in Texas but I would guess it would drop to 25-26 at 80.

Seems like you will spend more money driving at 80 rather than 70 or 75. In my opinion on good roads like I-10 in a car that has good tires,suspension and brakes you can drive safely at 80 but it will cost you more money to do so.
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Debrastorch
Veteran Author Florida

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Message Posted: Mar 31, 2012 8:48:34 PM

I also try to stick to 65 MPH. However, if I am in a rush, I go faster and do seem to use more gas. I read that 65 is a good way to save gas mileage on freeways
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antiguzzle
Sophomore Author Wichita

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Message Posted: Mar 31, 2012 5:47:23 PM

I drive between 50-60mph.
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bowling255
Sophomore Author Grand Rapids

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Message Posted: Mar 31, 2012 5:24:14 PM

I usually drive 65 on the highway get around 35MPG when I do.
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Jescareno22
Veteran Author Toms River

Posts:303
Points:58,070
Joined:Mar 2012
Message Posted: Mar 31, 2012 4:38:07 PM

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