I never cared for mileage life of a tire, I cared more about GRIP/Traction. If I were to fall/low side because lack of grip, that fix would cost more than a set of tires. I've always used DOT legal race rubber for the street. I would get less than 5000 miles before the center goes completely bald. I'm not touring the country so it works for me. In general, the harder a tire is, the longer the life but the traction isn't as good as say a race DOT legal tire which is softer/grippier.