Over on the CB forum the guys were getting horrible mileage out of their front oem Bridgestones with no seemingly good explanation until we started measuring tread depth on the new Bridgestone's and found out they were only had 4/32 tread when NEW (whereas the rears had 9/32 if memory serves me). So if you replaced at 2/32 tread depth, you were replacing the front at 6,000 while the rears were lasting 10K or more.
A switch to Michelin PR3's and the guys were back to wearing out the rears before the fronts, but both were going over 10K.
I think that may be the case with my front BS on the FJR as well.
2018 Yamaha FJR 1300A
2014 Honda CB1100 DLX
It doesn't matter what I ride, where I ride, or how far I ride... it only matters THAT I ride...every day. "Ferret"