2010V6Stang

Well its seems like the only mod that I havent pulled the trigger on yet because I am so unsure of what I want to do. I am debating between 3.73 and 4.10s both on an 8.8 takeoff. My question is how much will my gas be affected by either gears? I read that 373 increase rpm by 11% and 410 is 18%. I know MPG is affect by more then just RPM but it defintiely affects it. What kind of decrease in MPG am I looking at from either gears? I dont do any highway driving currently so at first im sure it wont affect me at all but in about 6 months I will be driving highway about 90 miles a week. This will also most likely incease to maybe around 200 Highway Miles a week in about a year and a half. So with all that considered what kind of MPG am I looking at with either gears?

Forgot to mention its an Auto.

Nuke

The real impact on fuel mileage with respect to gears, other than how hard you are coming off the line and how high you tach before you shift, is the engines cruising RPM. Around town, I feel you can get decent fuel mileage no matter what gears you have provided you're not doing a lot of high reving shifts and jack rabbit starts. It's simple common sense; the more you load the engine the more fuel. Even with 4.10's, if you're gentle on the gas until you need it, there's little impact on mileage.

The V8's in our S197 have a sweet spot around 1600-1800 RPM when cruising. Even with my 3.55's, at 1800 RPM I'm only running about 68 MPH in that range and on those 6-12 hour trips, I just can't do it...

4.10's in an auto can be a bit steep. Get feedback from those that have done 4.10's.

discodave

I have a 2010 V6 Auto also and went with the 4.10 gears. From what I've heard from most, if you have an auto you should go with 4.10s, and if you don't you will always end up wondering "what would the 4.10s feel like?".

My gas mileage did go down about 0.5 miles per gallon, which is only a decrese of 7 miles per tank, 10 miles per tank at most.

I have driven a 2010 V6 Auto with the 3.73s and it felt great, but not as great as the 4.10s feel.

There is definitely a difference in "pulling power", meaning that when you're cruising up a hill, you will just keep on cruising and your car most likely won't have to downshift to maintain your speed. With the 4.10s and you hit the gas you get an IMMEDIATE response.

I say go 4.10s, not just because I did, but because I've felt the difference between the two. The only real disadvantage is gas mileage, and like I stated above, it's a decrease of 10 miles per tank at most.

discodave

Oh, and forgot to mention, you might also want to get an Aftermarket CAI and a good tune. I noticed a huge difference is throttle response after adding them, especially with the Tillman "All Out" Tune. I got that after the gears and it's awesome. Having an auto, you know how the shifting normally goes. Well, with that tune it's amazing. I've tried a few other tunes as well and the Tillman "All Out" is the way to go.

2010V6Stang

Thanks Dave I knew you would have an answer for me. I could care less about any loss of the MPG as long as its only 1-2. Once it gets to like 3-4 then I would have a problem. Also I do have a tune though only the Frpp it still feels much better then stock, I will get a real tune and CAI in a few years but would like my warranty for now.

2010V6Stang

Hey dave, how much highway vs city driving do you do?

discodave

I do an equal amount of both every day on my way to and from work. It seems like I get the same gas mileage no matter where I'm driving, highway or city. City driving is easier with the gears because it takes less gas to "get you going", but on the highway you will be at higher RPMs so you will use a little more gas there.

Kona6Stang10

I want's teh 4.10's but I can no haz....cuz i'm teh poorz college anesthesia student ((

2010V6Stang

You just have to start your own business if you want to do mods man