Welcome to the site mrmojo.
If you're looking to save money, wheels aren't the place to spend on ecomods. But, do make sure you select a low rolling resistance tire for your replacement. They usually don't cost any more than normal tires and they will get you better mileage.
Speaking of where to spend money, instrumentation! Get yourself a scangauge or ultragauge. It'll help out a lot.
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