I was hoping to get 100,000 miles out of the tires on my truck, but the rainy season is approaching and the tread was getting thin.  So off to Discount Tire today to replace the tires.  The guy at the tire shop was not at all surprised that I had put 93,000 miles on the stock tires (Uniroyal Tiger Paw radials).  Apparently, those tires are rated at 80,000 miles and he regularly sees people get 100,000 miles or more.  I find that very surprising, considering how inexpensive the tires are:  about $320.00 for a set of four, including mounting and balancing.  And I remember being surprised the first time I got 40,000 miles on a set of tires.