I run 18x9front and 18x10 bullitt deep dish on my 2008GT they are B.F. Goodrich G-force supersport A/S 255/45-18 frt and 275/40-18 rear I currently have over 30,000 miles on them and they have about 60% tread life left , if you keep the air pressure set to 35lbs they should last for 55 to 60,000...