I still have them on my 18" wheels but they've been sitting in my garage. I only have maybe 1k miles on them. I think they would last maybe 3k miles but they are way too soft for the area I live in. The 405 freeway is not a good place to drive on hoosiers. I had two blowouts so far. So I just took them off until I can find some decent tires.
I'll order a pair of street tires for the fronts and drive the hoosiers on rears until they wear out. Then use DRs.