We have 10,000 miles on our Via so we do not need new tires, but I keep the air pressure at 65 psi on the front and about 62 psi on the rear. On our diesel pusher we replaced Goodyears with Michelins and were very happy with them. Interesting comments on the steel valves, and I would like to here more about that subject from others. It is a pain to check tire pressure and add air, and currently I am removeing the wheel covers to do this. I am concerned that valve extenders are prone to leaking.