I am on my second M3 front and I replaced my M3 rear with a Z6 about 5K ago. The M3 is an awesome tire! I got 4100 miles out of mine and that seems to be about the norm. Which for me was a 25% increase in tire life from stock. The Z6 was an experiment for me but I am also pretty happy with it! It lacks the outright grip of the M3 but it has 5k on it now and it probably still has 2-3k left! Tough tire! I initially bought it as a wet weather replacement for our northwest spring weather but it has lasted most of the summer with no worries. The M3 is a good Wet weather tire, the Z6 a great wet weather tire! The Z6 is a good dry weather tire, the M3 isa great dry weather tire!