re: F-150 owners: What brand of all-terrains would you recommend

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Does the AT effect MPG that much? I had toyo mud country on my last f-150 and the mpg went to shite

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Depends on tire size and tire ply. The Cooper Discoverer AT3's in a 275/60/20 are 4 ply tires; so they don't weigh much more than a normal street tire. If you go to a bigger tire in a load range E 8 ply, you'll notice a difference.