All 4 tires were brand new when I got the car. After 13,000 miles (90% highway), the rears are already at the 2/32 mark. That seems like a quick wear, even for the desert heat.
Anyway, I'm not really sad about that since I can finally get rid of them for some better quality, but I have never had tires wear out that quickly. (other than on a Corvette, but thats a completely different thing).