Swapped my Santiago alloys rear to front @ 7500 miles
7.3mm on the backs (average) -now on the fronts, and 6mm on the fronts (now on the backs), to try and even out the wear, and prolong the mileage I get out of a set.
Don't think these Pirelli P-Zeros are going to last anywhere near the 21k miles I got out of the previous GTD's Tombstones, but overall for a 19" tyre, don't think they are doing that bad.