[thstone]

The rears typically wear faster than the fronts since they are doing all of the work in moving the car (propulsion) and Porsche drivers tend to be a little (hah!) lead-footed. And the majority of typical driving is mostly in a straight line so the fronts are just along for the ride and not really doing much work.

Fronts will typically wear at the same rate as the rears if you are doing a lot of canyon carving or other driving where you're spending a lot of time cranking it in the corners. In this case, the understeer built into the car will cause the fronts to scrub and wear at a rate similar to the rears.

If you track at lot, you are cornering hard on a fairly continual basis so you may find the the fronts wear even faster than the rears, especially if you haven't adjusted your tire pressures correctly and/or increased negative camber to minimize understeer and even out the wear across the tire (inside to outside).