Grudge Night

Hey guys how much will adding 3.73s to my rear affect gas mileage, i need some advice, i have never done it before so i just want to get a feel for what other peoples experiences were with it. It is bone stock. I just want to get a better launch but i wanna figure out how many mpgs im going to loose, i get like 23 highway right now. Thanks guys

Mike Morris

iTrader: (55)

What gears are in the car now?

farmington

iTrader: (14)

I went from 2.74 to 3.73 gears and probably only lost 1 mpg (A4). A4 or M6.

FirstYrLS1Z

iTrader: (4)

being an SS,you probably have 3.23s'.
guessing 3.23s' to 3.73s' will drop your mpg by 1.5,23 to about 21.5.
MPG is always 'right foot' and speed dependent.
with my OEM 3.23s',I got 24.5 on 7 trips to florida,with the 4.56s' for 4 identical trips I'm getting 21.5.

Grudge Night

alright thanks guys yeah i have 3.23s in it now, how will switching affect racing from a roll? will i still be able to hit top speeds as quick ?

Mike Morris

iTrader: (55)

Lose about a MPG. Performance will be a tad better. Since your auto, 323-373 doesn't yield that much

Detroit Gearbox

On a normally aspirated gas engine peak fuel economy is achieved at peak torque.
Your fuel efficiency will go up, not down.

01ssreda4

iTrader: (96)

No, no and NO