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My experience
Personal experience is that tire type can make a lot of difference. The tall skinny tires didn't help mpg at all.
Testing on bike tires has shown that a larger contact patch ( wider tire) yields a lower rolling resistance at the same pressure. I also experience a smoother ride with a wider tire/wheel combo -on both the truck and the bike. It also seems to take less powere on the bike using the wide combo on the bike.
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