Thanks Compress Ignite. That was very helpful and I am saving in My Favorites. I had my tires rotated and balanced today. It was 10,800 miles ago when I had them done at Firestone. They have 35K on them now (and I meant they were new, and now have 40K on them but could see how that read differently...my apologies) and Firestone said they looked like they only had about 15K on them and are in great shape. They had also inflated them to 36 psi and I had them put back down to 27 psi. I asked why they did this and said that is what they had in their system for my car...is that possible? My tires are rated at max 45psi (not low profile but standard). I will definately pay close attention to this area from now on and always check my tires correctly! Anyway, thanks to all for the helpful info.