It's the wearing out PR3s at 6k that isn't normal....
My PR2s (I've had too many sets to remember) lasted at least 10 to 12K...
Excactly! My current rear PR3 is wearing faily evenly across the tread but I'll be lucky if it makes 7K miles before I have to replace it! I got 11K out my PR2, and over 10K on both the previous PR3's and could have got more but had long trips coming up. I'm anal about my tire pressure and riding conditions have been pretty much the same...go figure. However I like the PR3 and will run it once again and hope for better results. The current front PR3 looks like it will go 15K.