Purchased my Suburban with at 30K miles and tires had been just installed by the dealer. I found they worked the best for me at 38psi, although GM suggests 32psi. Max inflate for the tires (cold) is 44psi, so this I was not over-inflating them. I did get better fuel mileage, a quieter ride, and more solid handling, and the ride was more firm but far from harsh. According to my TMS, they do heat up some and I've seen the pressures rise 5-6psi under a heavy load on hot summer days. Addmittedly, I've run them way past when most people would replace them (they've hit the wear bumps now) and would not pass inspection. But I am impressed with how evenly they have worn without feathering, cupping, or scalloping. I hope the replacements I purchase are identical in construction and compound and give me the same performance. I have never had a set of tires wear so evenly and last so long. Nothing to complain about and they are a perfect match for this vehicle size/weight/power/use.