I prefer 24.5 tires. By the time you buy new wheels and tires you will spend a lot of money. I have one truck that has the low pro 22.5's that gets better fuel mileage than the truck that has the tall rubber. I think the difference has as much to do with gearing and aerodynamics than the tire size. If you decide to go with the tall rubber you might check to see if you can find someone who wants to go to the smaller wheels and is willing to trade wheels with you.
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