I got 3000 miles out of the rear Metz Z4 (was it) that came with my Gen1 thou. Slow turning tyre, adequate grip but could slide when pushed hard in the dry, and had to back right off in the wet.
I then had a few sets of BT 021's, I was getting 4000 from the rear, double for the front. Good grip wet and dry, quite lively tyre, drops into corners.
Now running PR2's got 6000 miles from the rear, should get double that from the front. Great grip, good mileage, lovely neutral handing.