This thread started with discussion of mileage. So...
When I got my Jeep diesel, it had highway tires. I got 35 mpg when driving 65, and 30+ when driving 75 (both sans trailer). When the highway tires wore out, I replaced with all-terrain tires, and mileage dropped about 10%.
So, when discussing mileage, keep in mind that tires play a role in mileage, also.
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