Again, this is kinda like trying to compare gas mileage. Too many variables.
For example one guy above noted he got 16-23K miles on five sets of tires.
I have run through 6 sets of tires. My low mileage tire is 6.5K (Bridgestone) and my high mileage tire (Metzler) was 11K.
So I guess it is safe to say that you will get somewhere between 6.5K and 23K miles on a set of tires.
Also, some guys don't change tars till they are showing threads. I try to do mine when they get to the wear bars.
If you don't think riding style doesn't have a big impact on tire wear, think again. How you shift, clutch, brake, corner and accelate all play into the equation. So does road surface temperature and many other variables.
Obviously, I ride my bike a bit more aggressively than most. I caught this disease early in life and have never been able to fully get rid of it. However, I don't scrape the handlebar weights and mirrors in turns nearly as much as I used to. Maybe I am slowing down in my old age.