Sprinter, Michelin. Rotate roughly every 50,000 miles. I could get 150,000 or more out of them, but I'm a tread junkie, want at least 6/32 everywhere, and will absolutely replace all of them if one gets to 4/32 anywhere. So, I've replaced them at 120,000 to 130,000.
I've got 78,000 miles on...