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Both my Tacoma and my Dodge w250 (4wd, 4.10 gears, diesel: bought new in 1992-sold in 2004) got better fuel mileage with larger tires (all four tires). Both are manual transmissions. I got the same size tires for my ford (rear only; auto trany) in hopes that it'll get better fuel mileage too. I didn't have the stock size on the ford long enough to compare the two different tire sizes for fuel mileage.
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