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13' F150 FX2 - SCREW. AFE Intercooler - Charge Pipes - Stage 2 Intake - Downpipes - Unleashed Tune
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I am thinking about going up in size from the OE 275/55/20 (31.9"). to a 275/65/20 (34.1"). I am most likely going to go with a Goodyear Wrangler All Terrain as I do primarily city driving. Does anyone know how it will affect mileage and towing? and I am assuming the ride should be a little softer due to the taller sidewall?
 

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I had 275/55/20 stock tires on my 13 Platinum. I put on Toyo Open Country A/t ll 275/65/20 and I lost about 1 1/2 mpg's. The ride is a little stiffer with the 2" leveling kit and new tires.
 

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Most of the stiffness and the lost of MPG comes from the the heavier construction load E range tires in the 275/65/20 size. Most of the tires in this range are 15 to 20 lbs heavier each than the OEM passenger car tires. 20 x 4 is 80 lbs. This is also unsprung weight as well, meaning its around 10 times the effect of sprung weight. In essence this is like carrying 800 lbs of sprung weight in the bed. One additional criteria is that this extra mass is rotating that the powertrain now has to overcome compared to the lighter OEM tire. This eats away at yet more efficiency.
 

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Screw the MPGs, the badass is what matters. 275/65R20 Cooper AT3's
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VS.
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