Congratulations! You're gonna love the 3400RL. Our rig "feels" most comfortable on the interstate at 65mph. It may not be the best fuel economy (avg 11mpg) but it's very comfortable for going up and down overpasses and small hills. I think I'll try the 58mph and see what happens. After talking to a friend with the same truck and similar fiver, I just ordered the Diablosport Predator. Curious to see what that does for mpg.
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