I'm willing to bet, most never think of checking the tire pressure. Or don't think of running them 2-3 pds higher then what it says in the car door sticker. The tires that came on your car 10 years ago are probably not even made anymore. And whats available today are way better, and will last longer at higher pressure. I can't remember having a tire that needed to be changed due to it being bald. Road hazzard's will ruin a tire, but mine usually get changed out due to age. Towing will eat tires, and buying the cheapest tire you can find won't help them last.,,