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stretch some tires :-D
youtube up "stretch tires" theres a video of some guys stretching a space saver on a wide rim. it looks alot like a really big motorcycle tire. However i do not recommend it. just get the smallest rims you can get, then get as thin as possible tires, then stretch them.
EDIT: my example is this. I drive a 94 Jeep grand cherokee. its about a 4000 pound vehicle. i bought 215s that were in the proper weight range. then i put them on my rims that are 7inches wide. 215s can stretch onto 7in wheels fine (albeit harder when you buy the tires new, you probably want to goto a drift shop.) I HAVE put older 205s on the 7in rims perfectly, but i didnt run them long enough. they were just old temporary tires. But i would also recommend getting tires that are about the same height. IE: i went from 235 75r15s to 215 75r15s, if I could find 215 80R15s i would get them. This is so you don't have to compensate the speedometer for the rpm increase etc etc.
i want to say getting thinner tires got me an extra 1-2 mpg, more on the 1 side than 2.
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