RalphWiggum 0 I know the general concensus is that a larger diameter wheel equates to less mileage...or is it? I want to go to a 17 inch wheel and new tires, since we all know the OE tires suck. As long as the overall diameter of the tire is +/- 3% of the original 195/55R15 then wouldn't the mileage remain about the same? The +/- 3% of the original tire diameter is considered replacement by most tire shops...it keeps your speedo consistent, or so they say. Does anyone have some experience with this sort of thing?