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Discussion Starter #1
if i were to go to a 19.5 rim with commercial tires, would it increase my mpg?

also, if going from 235/85 to 265/75 would that decrease my mpg?
 

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John Wood Nut Swinger
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I went from stock tires to 35's and went from 20mpg to 18mpg. If you just change to 19.5's keeping the same tire diameter as stock it will not affect your mileage.
 

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Discussion Starter #3
so what about with width, that would decrease mpg to then right?
 
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