Like slowmover said, it sounds like you'll be replacing the tires soon anyway. You don't need to worry about the expected fuel savings paying for the whole set of tires. For the LRR or low-weight or what-have-you tires to be considered a good investment, the fuel savings should recoup the difference between those fancy wheels and the stock replacement wheels. And of course, it should recoup that difference within about five years, ten max, because by that time you'll probably have to replace them again.
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