I'm running 275/60r20's on stock suspension and i keep mine at 40 psi cold. The ride is still smooth in my opinion, cuts down a little on road noise, seem to be wearing evenly across the tire and i'm averaging 18+ mpg consistently. So far extremely happy with the truck and the tires. I've put about 25,000 miles (only 6,000 with them on my sierra and the rest on the f-150 i traded in on the sierra) so far on them and they still have lots of tread left. If they continue to wear like they are i see no problem getting 50-60k miles out of this set.