On my 09 FLHR, the mileage is at 17,000 miles... The rear tire is very good yet, with about 3/32+ left there... The front 408 is really Close to Needing a new one...... Good wear and no cupping so I'll probably Carefully go a few Thous. more and change Both Out,,, Hoping to get at least the same or better mileage on the next set. I will buy the same stock replacement tires and look at the date on my old and New when bought..
signed....BUBBIE
PS: these are the original from new on the bike (no tire changed yet)
It is hard to compare different rubber tires and model bike as they are Different!