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Oh...... Squirrel!
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If you regear it wont hurt you and you even might gain some, but regearing means $$$
 

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Also, you will need to at least figure the tire size into the formula for miles per gallon if you don't do the speedo corrections. I get 16 with my 285s around town and back and forth to fairbanks (about 25 miles one way).
 
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