I thought I would post this up.
My OEM rotors have done enough mileage (20K) to be close to replacing, based on previous changes. Being out of warranty, I bought a digital brake measuring caliper to check my rotor thickness. In two days at NJMP in the advanced group, 4 x 25 minute sessions, plus about 1.5K normal driving, I used 0.1 mm of brake rotor with PFC-01 pads. The right front rotor was at ~29.00, and now it is at ~28.90 (28.4 is the minimum thickness). The left rotor is more warn than the right, not surprisingly, by about 0.1mm difference. The measurements were consistent at the outer, middle and inside measuring at 8 locations (every two drilled lines).
The rotors are 30mm out of the box.
PS The car passed 066666 last night on the way home...
. The new M3 can't come soon enough. I think I will pass on the Lime Rock Special Edition E92