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Old 03-19-2010, 10:51 AM
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tire question math stuff

hey am i doing this right im trying to covert my gas milage so say i get 350 miles per tank and thats about a 25 gallons ( i know i have about a 29G tank but i usally only put 25 in) k i have LT285/65R20/E on the truck now and stock it have LT275/65R20/E so at 45mph the 275 turns 610 rev per mile and the 285 turns 599 rev per mile so thats only like a 2% difference right? so in turn i only get 7 miles more then what the odom. says??? so i'm getting say 12.5 miles per gallon.

whats the total amount of miles you get per tank or per gallon?
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Old 03-19-2010, 11:34 AM
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You need to figure out why your getting poor fuel mileage. My truck pulls 450-500 miles per tank.

Really tire size doesn't matter. The gear ratio is a bigger factor then tire size.
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Old 03-19-2010, 11:52 AM
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You're right...there isn't that much of a difference between 285's and 265's. There's lots of difference calculators on the internet too if you want to check things, but i think you have it right. But i think you are dividing 350 by 29 gallons instead of the 25 you're actually putting in it. So really you're getting close to 14mpg.

I get over 400 everytime and i'm running 285's on 17inch rims....middle number is 70 or 75. But i have a set of 35's on 18inch rims for summer...and i actually get a little better mileage with bigger tires because of the rpm's being lower once im up and running on the highway.
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Old 03-19-2010, 03:45 PM
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yeah its a 05 F350 and i do about 25 miles each way to work on the hiway at around 60-65mph has anyone had this problem and fixed it?
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