Any AT tire even in a C rating, is going to affect the rolling mass over an all weather tire like the factory Dunlops. You just have more rubber mass and weight to roll.
Just got back from a 2450 mile trip from Seattle to Cody and back through YNP and GTNP - got 22.4 on the computer and about the same my calculations.
I am thrilled.
My truck is a bone stock 2015 SR5.
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2015 TEP 30 mile one trip to work.60mph