running 255/75/17 KO2's on my 2021 and the speedo is about spot on with the larger tires now. Unfortunately between accurate miles and heavier tires the mpg also droppedI went with the measured sizes and calculated the difference in distance traveled represented as a percentage. I have run 255/75 before on a 4th gen, so I was pretty familiar with what I was getting. When I considered my biggest gripe with the 5th gen I previously owned (mileage) I recalled that the 255/75 size has a slight advantage being only 10in wide, but still worthwhile upgrade over the 30.5" diameter tires that came stock. Obviously these rigs will run 33" tires stock, so it required some self control, lol. I've got about 600 miles on the tires now and I'm very satisfied!
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