I've got 45,000 on my stock Michelins and probably have 5-10,000 miles left. Rotate every 5-10,000. Discount Tire and Sam's Club both sell the A/S and M/S. They both run around 160 each, mounted and balanced. My tires have done great and worn very evenly. I think the kind of driving you do and how much your foot is in it make the biggest difference. The guys who go really long on their tires also seem to have pretty high mileage in short periods of time indicating a lot of highway use at constant pressures. I also would guess that the hotter climates such as Phoenix are a bit harder on tires.