Certainly a lot of it depends on your driving style and highway vs city miles. I had 3-seasons on my '15 SRT and they were toast at 9200 miles... might have gotten another 500 out of them. I have All-Seasons on my TH, and they should get better... I will be disappointed if I don't get 15k out of them. Doubtful that I will get 20k, but I am mostly a city driver, with very few highway trips considered "long distance."
I had them on my SRT jeep, I was at 15k when I traded it in for the hellcat and they were pretty close to needing replacing, maybe could have gotten another 1 or 2k out of them. This is normal driving never raced or abused them. I'd say 15-20k max.
These came on my Durango RT. Granted not the power of the SRT or TH.... 8500 miles on them and just rotated them. Wife drives 90% local and the rears were down maybe 2/32 compared to the front. Some of the lines were gone on the rear but still present on the fronts. Seems to be wearing well on that car and not too quickly. I imagine if I were driving it every day they would wear a little quicker
I think my dad has the same set on his regular GC. Same mileage but look brand new...cause my dad doesn't drive hard.