Quote:
Originally Posted by BetsyBio
I wondering the same thing about wheel weight as I switch from 14in rims in the winter 20in rims in the summer.............
My question is does anyone think that the inertia of the heavier wheels is the main reason I am seeing an improvement in mpg or is it the higher psi in the tires ?
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I think it's probably due to change in gearing with the 20" wheels. I'd imagine they'll be a fair bit bigger than the 14"s in diammeter, so your engine should be doing lower revs for the same road speed. The higher psi may contribute slightly due to the reduced friction.
(sorry for the late reply)