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Wheels & Tires Semi-Tech General discussion of wheels and tires for the Ford Ranger.
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Old 03-04-2008
i_luv_strats's Avatar
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new tires and revs per mile

alrighty, i recently got a set of 265 75 16 destination mt's and my old tires were the same size, but i'm noticing that before i would go one mile in sixty seconds exactly at 60mph and with the same size mudders i'm going one mile in 1 minute 3 seconds and noticing a drop in fuel economy of 3 mpg 17mpg to 14mpg. perhaps the tread is taller giving me an off reading on the odometer? i looked around the web for revs per mile and i'm getting 637.23 for this size. take it that it has increased a bit with these tires and not sure how much i would increase it by on my tuner. kinda stumped, any input would be cool.
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Old 03-05-2008
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were your old tires the same brand or style? Try going to the manufactur's siteand see if they have any specs on true OD or rev's per mile
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Old 03-05-2008
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Since you can only increase you Revs per mile by increments of 5 I would try 635 and then 640 and see which one is more accurate.

As for the gas mileage that small of a tire increase should not effect you mileage that much. I would check the tire pressure of the new tires and I bet they are low.
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Old 03-05-2008
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checked the pressure and they are fine. the tires i had before were pathfinder sport suv, i did have to take my front mudflaps off because the mt's were rubbing on tight corners, the old tires didn't rub. so i think there is a bit of size difference. couldn't find anything on pathfinders web site or firestones about it, i'll try 635 and 640 revs per mile tonight or tomorow and see what happens.
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