When i went to 35s on my f150 I DID notice slightly better mileage on the highway because the engine was not working as hard to MAINTAIN the speed. But I also suffered worse mileage around town or stop and go because the engine had to over come the mass and increased rolling resistance of the larger tires. So you pretty much break even. Now if you ran a taller very skinny tire you might get a little better result.
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