This might sound crazy to you guys, but my bed cover SERIOUSLY increases my highway mileage. I've tried driving with it on and off many different times, and every time it's the same results. When I have it on, I get 18-22 at 75mph, depending on wind (I live in southeast north dakota, so its pretty dang flat here, but we get some crazy winds). When I have it off, I get maybe 12-25 mpg, again dependent on winds. My driving style doesn't change at all between having it on or off.
For the record, I have a 2019 crew cab with 5.7 NO etorque, 3.21 gears, about 30000 miles on her. I use a access roll up tonneau cover. I paid 100 bucks for it since a friend of mine works at the factory here in my hometown that they make them in.
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