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I wondering the same thing about wheel weight as I switch from 14in rims in the winter 20in rims in the summer.
What I have found is that I actually get better mileage with the larger rims, but only when driving mainly highway speeds and P&Ging. Because I can coast farther and take turns at faster speeds without using the brakes I think it also helps the mileage because I can put 55psi in the tires as apposed to 35-40psi with the 14 inch rims.
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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