My old van has 16 inch wheels on it, and i just know the rolling resistance is too much- prolly why gas mileage isn't up to par with the new ones. I looked at vans with 20's one'em, but the spin weight on those is so heavy, it just takes too much to accellerate, causing mileage to suffer.

So I bought a van with 18 inch wheels. perfect.

BWAHAHAHAHAHAHAAAAAA!!!

This is all funny, but I gotta go ride...