I just don't see how that is "safely" possible to get that mileage.......matter of fact I call bull-butter on that mileage.
My tire mileage:
0-4415 stock bridgestones (they were 50% worn, I just didn't like them)
4415-18001: rear PR2 (13586 miles)
4415-22700: front PR2 (18285 miles)
@ 35000: f/r PR2 (16999 miles rear, 12300 front; changed both 'cause I was headed on a cc trip)
35000-45988: f/r PR3 (10988 miles; changed early on another cc trip)
45988-present (56xxx) same PR3s. Front looks great, rear about 60% worn
Front brakes go about 30000 miles, I just changed the original rear pads at 56000 miles. I also get mid 40's mpg and have gotten over 300 miles to a few tanks when I needed to.
YMMV.