I just had a 4,682 mile 2011 C14 in and the front tire was worn well past the wear bars and cupped to **** while the rear was "flattened" but still had 1/32 over the wear bars. Those were the oe original tires, that apparently see much two up riding.
I do have some records of one C14 where he has been anywhere from 4300=5100 per rear and been usually seeing 5500-6200 out of fronts- and it really wasn't making much difference in what tire he ran. It was making more difference on where and how he rode.
Could ride on one tire- say a PR2 once and get 4300 miles then the next one be 5000
- then run a BT023 and get 4600 and follow it up with a 023GT and see 4400, and another 023GT and see 5100 etc...
But generally he never swayed from most to least by more than 800 miles on any of them, and quite often fronts were taken off and tossed with the rear, rather than have to come back in a weeks time.
I haven't been keeping track in a couple years as he started changing his own...maybe he figured those 4+ sets each year was worth a little equipment investment to save some time and money. Plus he has been on numerous out of state trips the past couple years and doing a lot of take the tire off, install new and return home and swap back to the one he took off etc...... that would be a lot of expense to pay someone to be doing twice as many tire changes.... (for sure negate out any perceived savings by swapping them so much)
I read comments of people claiming remarkable mileage out of certain tires, I think much of that has to do with road composition and how you ride, more than what tire you are riding on.
I have yet to see anyone locally who rides WI hill country on any bike with any tire, who rides with the group I ride with get more than about 5000 miles out of a rear tire, and the vast majority of riders are sub 4000 miles- with numerous of them sub 3000 miles.. Based on those who attend the every weekend riding---of course we have the grannies who putt around for weeks on end and only ride with the group once or twice a year who get more
My typical sport touring bike to come through usually sees about 8000 miles out of the rear, if there is such a thing as typical.
I have seen on numerous bikes for those who went from PR2's to PR3's and even PR4's that they dropped tire life mileage often in half.
And nearly none of the people who have used both the 023 ~now~ T30 vs a PR2 have seen any significant mileage difference between them.