If you're only getting 15mpg you are either putting your foot down too much, you have enough mods for your car to be considered a drag car only, or you have tuning issues. My last Stang ran mid 13's and got 18mpg even with my lead foot. That was with 3.73 gears. Your car is a bit heavier so that will make some difference, but I can't see 15mpg on a daily driven Stang. More info is needed, but generally stepping up in gear size isn't going to make a ton of difference unless you do a lot of highway driving. And even then it won't be so much you should regret the gear swap. 75% of my driving was on the highway and I never really noticed any difference myself.
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Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels.
"The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance."
Griggs Racing
ICQ# 42269241
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