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Adjusting MPG's for Tire Size

Discussion in 'Wheels & Tires' started by 90YotaPU, Nov 29, 2010.

  1. Nov 29, 2010 at 7:39 AM
    #1
    90YotaPU

    90YotaPU [OP] The Messiah

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    Mike
    Union County, NJ
    Vehicle:
    1990 Toyota 4x4 (Pre-Taco)
    Aftermarket Stereo, Spidertrax Wheel Spacers, HF Air Horns, 3" Lift
    Just curious, but I thought I read somewhere on here that when increasing your tire size, you need to add a certain percentage to your new MPG to adjust for the size increase. In my mind, this makes no sense as the speedometer and odometer gear / calibration did not change. So as far as the truck is concerned, the rear end still only turns a certain number of times despite how far the truck goes. Basically, I'm trying to figure out how many miles to the tank I lost when I upgraded from the 245/75r16's (stock Dunlops) to the 265/75r16's (Hankook Dynapro's). I was averaging between 390 and 400 miles to the tank before and now I'm getting around 370-380 per tank. Should I be increasing the new miles per tank to be accurate?

    Just for the record, I understand this is a truck and gas mileage will be low. I'm actually not concerned with it especially being I only commute 7 miles each way to work and my old '99 Taco only got 16 mpgs. This is more for OCD (or CDO if I arrange the letters in order like they should be.lol).

    Tried doing a search for it but came up with nothing.
     
  2. Nov 29, 2010 at 8:01 AM
    #2
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    Massachusetts
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    '13 Ford F-150 SCREW
    F-150 Mod
    Using the tire size calculator, you'd have to add 3.7% to your ODO. (Use your ODO x 1.037 = Actual mileage)
     
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