Larger circumference tires better mileage?
I am wondering if this could be true. I ordered my dually with the 4.10 rear axle for more power pulling the heavy 5th wheel. At 70 mph I'm over 2000rpm. Now that I'm getting a TC I don't need that mu...
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My experience too, is that larger tires (on the same size wheel) have worse dynamics that increase fuel consumption, in spite of their larger circumference. I see you already have very tall tires (80-series). I would think you might get a slight fuel saving with lower-profile tires on larger wheels, but likely never enough to offset the cost of them. And keep in mind that at highway speeds the largest contributor to fuel consumption is wind resistance. Many TC's have similar frontal area to 5'ers.
