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tire diameter
This question is kind of for metrompg but would like anybodys input. Has anybody checked out the difference in fuel economy in say the 12, 13 and 14, maybe even bigger ties all at the SAME RPM, for example, 12 inch tire at 3000 rpm and 55 mph versus 14 in tire at 3000 rpm and 55 mph, especially since the 12 inch should be alot lighter and narrower, even less sidewall to flex. ( assuming we arnt going into expensive low profiles.)
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