I saw normally 22-23 mpg mixed highway/city with more highway with stock gears. I hit 25mpg once. Since the gears I hit 25mpg once, but probaly see more around 20-23 depending on driving conditions.
i hit 20 almost everytime i fill up and thats all city driving and im not really driving like an old person either i still have some fun once in a while
I get 18 mixed on my modded bullitt (3.73's). my vert is stock except for intake and weld in mufflers and it gets 14...go figure. I think cause its slower I am harder on the gas pedal in my vert.