I am also running the Pilot Super Sports on my 2013 GT vert. Their traction is much better the the PZeros, even after 17,000 miles. Below about 40 degrees they assume the traction characteristics of a hockey puck, so I don't run them for the 5 months of winter in St. Louis. Although they don't have as great a traction characteristic after 17,000 miles, I am confident they will be good for the road (I used them on road course tracks earlier in their life) at least up to 25,000 miles.
2013 Mustang GT Premium Convertible
Candy Apple Red, Auto, FRPP Tune, GT500 Axlebacks, KONI Yellow Sport (adjustable dampers), FRPP Front and Rear swaybars, Custom Removable 4 Point Roll-Bar, BOSS 302 Low Expansion Brake Lines, Roush side splitters, GT500 spoiler, Redline Tuning hood struts,18" Ford Chromed Aluminum Wheels (9R3Z-1K007-A), Michelin Pilot Super Sports - 235X50X18
2011 Mustang V6 Premium Convertible - Gone