Originally Posted by h22accord
Bigger rims and tires create more rotational mass, which usually leads to 1 or 2 mpg less. Also because of the larger diameter you are actually traveling further and faster than the speedo and odometer are indicating which could make up another 1 or 2 mpg loss.
Thanks man, now i have some idea. I didn't think there would be any difference with the wheels though 'cause the diameter is actually slightly less than my stock tires. Think the closest you can get to stock size is 205/45/17 and mine are 215/40/17. Anyway, again, much thanks. Thinking of letting some air out though cause it feels like now i'm beating my suspension to death, guess i'll just have to fine tune it, i just don't wanna ruin expensive tires...