Our TT is driven almost exclusively by the female in the family. She is not as aggressive as I would be if I got to drive it everyday but she still puts her foot in it now and again. Anyway, we're getting about 30-35K on a set. The original tires didn't last long, then we went with Michelin Pilot Sports. Good tires and we got about 30-35K. Now we are running Fulda's "Extremo" and they seem quite good so far. Only about 7K on them though. We do the rotation thing religiously. Uni-directionals make it easy to do. Hope this helps.
Adios!
Adios!