I understand debris flats. How many miles would you without debris?
I have 4819 miles on my 2012 7.3 fx and while the tires are worn there is no cord showing or tread separation. Of course the rear is worn a little more than the front. I'm expecting to get over 5000 miles, but how much more I don't know.
I have a set of 700c H2's with 1600 miles on them. Font shows almost no wear. Rear shows little wear. Zero flats to date and I have pulled many tiny glass slivers and and even more pieces of radials out that not have not punctured the tube. I expect to get at least another 2000 miles out of them.