Whats Your MPG

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Re: Whats Your MPG

Postby ___Scott___ » Mon Feb 24, 2014 5:15 am

One mod that seldom gets considered when fuel economy is discussed is tires. Some have lower rolling resistance than others, and of course air pressure plays an important roll.

My latest experience is with winter tires. I ran Continental Extreme Winter Contact tires for several years and was generally getting 28 to 30 mpg (US gallons) in a daily commute mix of about 20/80 percent city/highway driving on my bone-stock ST165. They were used up before this winter arrived and I would have bought another set because they were really great tires (I did buy a set for my wifes Jeep,) but they were not available in the size I like for winter (185/70/14.) I settled on General Altimax Arctic tires that size. Since the switch, my fuel economy has dropped about 3 mpg with the same commute on the same car and no other mods.

On a winter tire note: the ice/snow grip of the Altimax Arctic is just as good as the Extreme Winter Contact tires, but suck in every other way. The Continentals communicated very well so I always knew how much grip I had before they let go. The Generals don't communicate at all and I have to stab the brakes or jerk the steering wheel to figure out how much grip is there. The handling characteristics of the Generals are just plain spooky and cross-wind stability is the worst I've ever experienced with any tire. Unfortunately winter tire options in the 185/70/14 size are pretty limited so I guess I have to settle for what's available.
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Last edited by ___Scott___ on Tue Feb 25, 2014 4:04 am, edited 1 time in total.
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Re: Whats Your MPG

Postby phattyduck » Mon Feb 24, 2014 10:26 pm

Gary ST165 wrote:best i have seen in my ST185 RC with MoTeC M4 ecu is 36+ mpg at 60 mph on a long journey
Convert that to US gallons and its less impressive (something like 31 mpg). :twisted:

I now get 22-23 mpg in my daily driving with larger than stock rolling diameter Pilot Super Sport tires
I used to get 24-25 mpg with older Nitto Neo-gen tires, slightly undersized
Before the ST205 swap (3s-fe auto) I would get 24-26 mpg, generally

From what I have heard/read, the ST205 gets better mileage along with making more power, stock for stock, than the ST185 or ST165. Oh, and my car has a full 3" exhaust, intake and FMIC. Stock otherwise for the drivetrain.

And tires can make a huge difference - sticky 17" tires on my WRX = 24-26 mpg, 16" all-seasons = 28-30 mpg

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Re: Whats Your MPG

Postby warracer » Mon Feb 24, 2014 10:41 pm

I get around 23-25mpg ish while daily driving on 195 55 R15 on Nokian hakka 4 winter tire :)
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Re: Whats Your MPG

Postby New Guy » Tue Feb 25, 2014 2:10 am

I run 195/65r14s on my SV25 and the highest I ever saw was 27.8mpg (US gallons) on the freeway. Highway fuel economy has always been so-so at between 24 and 26mpg, lower on winter blend fuel which is what you usually get in New Mexico.
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Re: Whats Your MPG

Postby Mafix » Fri Feb 28, 2014 5:07 pm

I go from gallons per mile at the strip, to 28mpg if I drive nice. normally about 20mpg
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Re: Whats Your MPG

Postby Awesome-Trac » Sat Mar 01, 2014 6:21 pm

Do you guys have a certain RPM that you guys shift at? Most people have been telling me to shift at 3k to save gas
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Re: Whats Your MPG

Postby mike325ci » Sun Mar 02, 2014 12:42 am

I have never gotten above 30mpg in this car ('92 ST185, fairly stock, stock engine w/2.5" DP/exh)

Highway only road trips: 22.6 mpg the last time I measured it
Normal New York City driving day-to-day: ~15-17mpg

This is with the boost controller off. (I only turn it on for autocross/track days (16psi) and when I want to drive a little with no destination (12psi)).
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Re: Whats Your MPG

Postby ___Scott___ » Sun Mar 02, 2014 2:34 am

Awesome-Trac wrote:Do you guys have a certain RPM that you guys shift at? Most people have been telling me to shift at 3k to save gas

If you are trying to save gas, then RPM is the enemy. That means using the highest gear possible everywhere you go, and coasting down hills, coasting up to stop lights etc.... Pump your tires up to about 36 psi. Get up to speed at a good pace, but not too slow and not too quickly.
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Re: Whats Your MPG

Postby underscore » Sun Mar 02, 2014 5:37 am

___Scott___ wrote:
Awesome-Trac wrote:Do you guys have a certain RPM that you guys shift at? Most people have been telling me to shift at 3k to save gas

If you are trying to save gas, then RPM is the enemy. That means using the highest gear possible everywhere you go, and coasting down hills, coasting up to stop lights etc.... Pump your tires up to about 36 psi. Get up to speed at a good pace, but not too slow and not too quickly.


Within reason of course, if you bog down too much you're wasting fuel. Also for downhills and slowing down you want to coast in gear so you're not using any fuel.
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Re: Whats Your MPG

Postby ___Scott___ » Sun Mar 02, 2014 11:18 pm

underscore wrote:Within reason of course, if you bog down too much you're wasting fuel. Also for downhills and slowing down you want to coast in gear so you're not using any fuel.

Agreed, no bogging. As for coasting, if you are slowing for traffic or a stop light, then doing so in gear makes sense. If you happen to live where you can coast for a mile or two on your daily commute, you should even if you have to put it back in gear and get back up to speed occasionally. Preserve momentum where you can by taking the "fast line" while coasting.

Just changing my driving style when I was doing mostly city driving yielded a 12% gain in mpg.
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Re: Whats Your MPG

Postby WideFNopen » Mon Mar 03, 2014 3:36 am

4-5 mpg on special stage running E85, about 15 mpg when in transit.
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Re: Whats Your MPG

Postby leboe » Wed Aug 13, 2014 5:28 am

Just drove 500km from Squamish BC to Vernon BC, averaged 8L/100KM (30mpg). And I was bagging the absolute piss out of my Carib, on the freeway I was between 120-150kmph (75-95mph) on mountainous highway.
100km of the drive was thicker traffic leaving Vancouver area
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