Originally Posted by DoomsdayFAN
What kind of gas mileage does a heavily built or fully built STi get, ballpark? Is there an "economy" tune to switch over to when wanting to save on gas and keep her running a little slower?
You don't buy these cars if your worried about spending money on gas. I was getting about 16mpg on E85 with my WRX in mixed driving. Slightly higher running 91. The worse I ever got was 4mpg while canyon carving. You can switch maps to be more economical, but it's not going to be a huge improvement. The best way to save gas is to stay out of boost.