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I raced banshees and sleds for years and I know for sure there is a noticable difference between different weight tires. Not sure how size effects its but weight definately does. I would put tires on the back of my banshee that were less than one pound heavier than the ones that were installed and the machine could no longer pull 6th gear. Im sure this translates to mpg Im just not sure exactly how much. I usually try to find the lightest tires possible weather its on my metro or my rhino or my van....
rotating mass matters most...
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