285s or 315s for fuel mileage? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 2 (permalink) Old 02-07-2012, 10:57 AM Thread Starter
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285s or 315s for fuel mileage?

What do you guys think? Would I be better off with a 285/75/16 or a 315/75/16 for fuel mileage? 97 f350 cclb with 4.10 gears running 35s now but time for new tires let me know your input thanks
Trent

97 F350 4X4 CREW CAB LONG BED


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post #2 of 2 (permalink) Old 02-07-2012, 12:54 PM
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You'll lose about 5.5" of circumference by going 285, but it is a narrower tire which means less rolling resistance. I would say stay with 315 since you have 4.10 gears though. Lower rpm's add up over the long run.

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