i heard the same too. wondering if its just another urban legend from the people who get jealous of other people who can afford bigger rims. but i think it does make sense. bigger wider rims = more mass = heavier = more petrol consumption. some say with smaller sidewall on tyre can also cause louder noise..... or is it?? the urban legends continue......until someone with experience come here and comment on this lah.

Is it just me or larger wheels (which is usually the case if you go for larger wheels) should actually improve FC since for a given rev on your engine, you could cover more distance. Of course, it's harder to accelerate because it's larger but while it results in longer brake distance it also allows better cruising ability. I am under the impression that larger wheels will improve FC - else everyone will opt for smaller wheels.