I also ride like a sport-tourer - lots of 200-400 mile trips (and I commute 55 miles daily) - have 5000 now on a Pilot Road rear - looks like I'm about 1/2 way through the legal tread.
The rear does not feel as planted as the Pilot Power rear I had before, but still solid, and it looks like I'll get 9-10K out of the rear before I look to replace (I always replace with tread left - too much rain down here to ride a slick)