Join Date: Feb 2009
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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.
2006 F250 CC Short Box Lariat
4" ProComp lift
18" Ice Metal Chrome Rims with 35" Kumho KL78's
Banks Monster Turbo Back Exhaust
Edge Attitude with A2 moniter and back up camera
AFE Stage II intake
Pace Edwards roll up bed cover
10" Sub in Center Console