I've had my '09 GT for a couple months now, and have yet to reset the avg. fuel calculator. Going on 4500 miles on the car, and it's average is 25.7 mpg.

A fair amount of my commuting is highway / windows up / no AC / cruise on 71 mph.... so that helps. And when I'm not horsing around with it, I short shift/skip shift.

It's a GT Coupe, 5-speed manual, 3.31s, Wingless, 255/45 x 18 Eagle F1 Supercars at 36 psi.

Definitely better FE than I expected.

 

I drive mostly in the city and some highway. I get on average 13-15mpg. But I have a heavy lead foot. Best mpg I ever got was like 20mpg all highway.