98% street, 2% track use. I used them for 3 track events and 3 lapping days. If it's any indication, the race pads I was using (DTC70's) have most of their life left... as do my street pads. I can snap a picture later today of both the street pads and the track pads.
For total miles the BBK was mounted on the car, I would guess in the 6-8k mile range. A lot of those miles were on the dyno, and the majority of them were highway miles (1000 miles from tuner to my city, and 350 mile round trips between my place and the track).