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Even a slight change in the road grade can affect mileage. I can get 18-19 mpg with my Goodyear Wrangler Duratrac's in my 2012 F350 crew cab long bed heading south from Fort Collins to Denver, but I can't get it going north.
With my Excursion and current F350 the stock Michelin highway tires got 2mpg better mileage than the Duratrac's or Hankook DynoPro AT-M's I have run.
Going 65mph also makes a big difference in mileage, that seems to be the sweet spot. With that being said, I can't drive that slow on a consistent basis.....
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