I got 2k out of my original Pirelli Scorpion rear. Thats from new, zero miles. I wondered what I had let myself in for!
Luckily AnakeeIII, Roadsmart3's and Michelin Pilot Trail 5 (?) all lasted till approx 5k with definite more naughty riding than when running in.
Triumph Street Twins (I fancied one) Pirelli Phantoms are notoriously bad. The OE are made in Brazil with over 3mm of tread. Off the shelf are made in Germany with 5mm.
I have Pirelli RossoIII's on the Speed Twin which i have loved (far out perform the suspension) and have shagged a rear (

) in a little over 2k. Will be going for the same boot from the shop as a replacement so will see how that compares. Maybe Triumph splashed the cash and gave this bike proper rubber....