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  1. #11
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    finalday7's Avatar
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    Oct 2007
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    Sayward, B.C Canada
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    1,358

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    I went over and inch and half bigger on my last truck with no decrease in mpg. Maybe .2 or .3 which isn't enough to matter. Now upgrading from say a 29" tire to 35's. Yeah that will hurt you.

  2. #12
    Former Member
    Join Date
    Oct 2007
    Location
    Huntsville, Alabama
    Posts
    372

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    You could also spring for a programmer. A good one will usually correct for over/under sized tires. I had stock wheels and when I put on my aftermarkets I could definitely tell a difference, but I put a programmer in and recalibrated the computer and it seems like everything is back to normal. As far as gas mileage is concerned, its always sucked so it makes no difference to me.

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