I've been running 225's for several years. There is no rubbing, and almost no effect on the fuel mileage unless you go by the manufacturer's tire pressure recommendations. The sticker on my '96 recommends 23psi. At that pressure, the mileage drops to the low 20's (typically 23MPG). Pump them up to 32psi, and you get high 20's (around 29MPG). It rides like a brick on a roller skate, but tread wear is still pretty even, after about 50K miles. Off road, the 225's seem to do best at about 15psi, especially on gravel and sand.