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Old 08-30-2012, 09:47 AM   #4 (permalink)
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Originally Posted by royanddoreen View Post
If I am using 5% larger circumference tires wouldn't this mean instead of getting 30 mpg I would of actually traveled 31.5 miles meaning 31.5 mpg?
That assumes that the tires are otherwise the same. If you have a different make and/or model of tire, there will be differences in rolling resistance - and some of those differences can be large enough to offset any gain you get due to diameter.

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