Those of you that are getting lower mileage with the larger tires, keep in mind that your speedo is off and if you have not re-calibrated the speedo it will seem as if you are getting much worse mileage.
In pacing my truck with a stock one as well as mileage markers, I have found that I need to add approximately 10% to my mileage calculation.
Example, if I go 450 miles on a tank, I need to add 45 miles (10%) to that figure before calculating my mpg, as I have actually travelled 495 miles but the speedo only measures 450.
Hope this helps!
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Terry S. '98 Quad Cab SLT, 2WD, 12V, 3. 54, AT, Trailer tow PKG, Camper PKG, OEM cab lights, 4" exhaust turndown, 5th W. Hitch, roll-top cover, tint, high performance K&N air filter, 265 Michelins and turbo silencer ring in tool box!
BOMB'n in Tacoma, WA.
19,300 miles - 5/7/00