I'm going to further this discussion, quite possibly into the arena of anal retentiveness, but here goes. I always get new BFGs every 50 thousand miles and usually have plenty of tread left on the old set. This time the old set had 9/32nds of tread left, the set before these, the old ones had 10/32nds of tread left. I just sold the used set for $350, kept a good spare and bought 4 tires. The time before I sold the used set of KMs, for $500 and bought a set of 5 tires. Either way, you do it, I'm spending $620 for 50,000 miles of wear which equates to 1.2 cents per mile. Had I run the tires down to 65,000 miles, they would be useless on the used market and I would have to pay $40 to dispose of them. Equaling 1.5 cents per mile. When all is said and done, when getting new tires every 50k miles I'm saving 3/10th of a cent per mile, compared to letting them wear down to uselessness. It's not a lot, but it equates, in our case to about $150 savings total, or $37 a year. Over the past 25 years, between two vehicles we have saved well over a thousand dollars.. This is something to consider for the longterm when buying tires and considering what your old tires will be worth on the used market. A lot of different brands out there are a lot less expensive than BFGs, Goodyears or Coopers, but only in the short term. I'd wager over the past 25 years my formula for purchasing new and selling used is a lot less expensive than less expensive rubber. I might also add that neither I or my wife have ever had a flat because of tire failure or puncture.. Just my humble opinion..