4200miles and going lol!^^^
Try Pirelli Diablo Corsa on an S1R. Back finished by 1300 miles.
Used to run PR2s on R1, Fz1 and GSXR1000. Tried PR3s on Multistrada 1200, got just over 4k from them. Didnt care for front tyre with the 3s, but the 4 is supposed to be harder compound (and redesigned sipes to stop it moving around) so should be the perfect tyre on the GS. Anything around 4-5k acceptable in my book for a top performing tyre.