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If you change your tire sizes and it is bigger than factory does it throw off just the speedo or does it mess with the mileage, mpg and fuel trip #'s as well? I know I should have lost some mpg with a bigger tire but 5mpg for a 1.5" taller tire. That didnt even affect my duramax that much when i lifted it and went with a 10" taller tire.
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