[ac97gt]

i dont think that HP and MPG are DIRECTLY related... for example my cousin's 2000 camaro SS is putting out 330 or 340hp and he gets 26mpg highway. i know its a different motor entirely but it sorta proves that they are not quite as related as you think. im willing to bet that if everyone answered this you would find that plenty of people with the exact same hp are getting mpg that vary as much as 6 or 7mpg (even within modular mustangs). theres other factors here besides HP, like gears, probably tire size... im not an expert anyway, these guys could tell you for sure.