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post #1 of 28 Old November 6th, 2010, 04:04 PM Thread Starter
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gas milage decrease from gears

I was looking into getting a set of gears what is the effect on gas mileage from gears?
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post #2 of 28 Old November 6th, 2010, 04:11 PM
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I know your new but this has been discussed many times. Use the search feature. But there is no formula for mileage and gears. You may actually see an increase in mileage with better gearing because it makes it easier for the car to get up and go. Proper gearing can raise the efficiency level of your engine depending on the type of driving you do and the way your drive. There are too many variables for anyone to answer that question with any accuracy.


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post #3 of 28 Old November 6th, 2010, 05:15 PM
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what is the effect on gas mileage from gears?
It will change.
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post #4 of 28 Old November 6th, 2010, 05:24 PM
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post #5 of 28 Old November 6th, 2010, 05:40 PM Thread Starter
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ok thanks guys
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post #6 of 28 Old November 6th, 2010, 07:11 PM
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I got better gas mileage going from 3.55's to 4.10's.




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post #7 of 28 Old November 6th, 2010, 07:57 PM
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I got better gas mileage going from 3.55's to 4.10's.
Yeah, but you also did the throttle input regulation mod at the same time.
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post #8 of 28 Old November 7th, 2010, 12:01 AM
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chances are, you would be more likely to see a decrease if you do a lot of high speed driving. If you don't, the engine really isn't revving that much in 5th.
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post #9 of 28 Old November 7th, 2010, 12:05 AM
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I got better gas mileage going from 3.55's to 4.10's.
do you ever go above 50 mph? or is this city gas mileage increased? (i would hope so )

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post #10 of 28 Old November 7th, 2010, 12:27 AM
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It will change.
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post #11 of 28 Old November 7th, 2010, 01:04 AM
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do you ever go above 50 mph? or is this city gas mileage increased? (i would hope so )
Why do you say that? This could also hold true on the highway, especially if you are traversing hilly terrain. The lower gear ratio helps keep you in the sweet spot more and you don't have to lug your engine as much to pull hills. It also helps the manual guys from having to downshift as much.
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post #12 of 28 Old November 7th, 2010, 01:06 PM
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post #13 of 28 Old November 7th, 2010, 01:47 PM Thread Starter
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yea I do a crap load of interstate driving
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post #14 of 28 Old November 7th, 2010, 03:09 PM
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I used to do a lot of highway driving and went with 3.73s in my auto.. If i drive like a normal human being i can get great gas mileage.. If i drive like an old man on cruise control at 60-65 i can get 26mpg.

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post #15 of 28 Old November 7th, 2010, 03:30 PM
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If you spend more time over 70mph it will hurt your mpg worse than if you do a lot of city driving.
Not exactly true. I picked up about a mpg in my LTZ when I switched gear ratios. A lot of factors play into your fuel economy such as tire size, auto or manual, cruise control, etc.

I got a lot worse in the city after my gear change cause I was always standing on it to feel the acceleration.
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post #16 of 28 Old November 7th, 2010, 05:41 PM
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I drive mostly highway around 70-75 mph. I get stuck in traffic in the morning though.




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post #17 of 28 Old November 7th, 2010, 05:56 PM
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3.55's to 3.73's------250rpm
3.55's to 4.10's------500rpm

Edit: in 5th on the highway 70mph

Not a huge difference. Your city mileage will go up and if you are luckly your highway mileage will go up or stay the same. You may lose 1-2 mpg, maybe.

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post #18 of 28 Old November 7th, 2010, 08:41 PM
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Whats the best RPM in a stock S197? I usually have the MPG bars up on my dash but then other times I change it to the 'gallons till empty' display. I usually shift at 2.5-3k and cruise at 2k but im always in the city so it never really gets to stay at any RPM for any length of time.

I can feel the car start pulling at 3k but where would the best spot for MPG be at? The bars move too damn much to get a good reading anyways.


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post #19 of 28 Old November 7th, 2010, 08:46 PM
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i calculated 32mpg with my 4:10s with one trip i took
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post #20 of 28 Old November 7th, 2010, 09:33 PM
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i calculated 32mpg with my 4:10s with one trip i took
You need to go back to school.




I got 20.9 mpg's this summer when I took a trip to Iowa. I know a few people that have gotten mid to high 20's, but never in the 30's on these cars.




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