I don't know how many miles off hand with one, since the truck I have has been worked very hard and idled for many long hours over the years on the farm, plus when the speedo cable went my brother just drove it without. But I will say that since my main 6.9 truck is an 86 and it's never been torn down, though I know the rings could stand refreshing, it's worked it's ass off for the last quarter century + ....
That's all I can say about that.
And if I had the nickels and that truck was for sale with those rims and turbo - Sold!
I used to say that "It's better to ask forgiveness than for permission" but I'm divorced. Still, I like the concept