I've been autocrossing my Cobra a bit over the last few years and have noticed a lot of the drivers use Falkens and Kuhmos in the street tire classes. Both companies make a sticky tire (Falken RT-615, what I run now, and Kuhmo Ecxta MX ??) that have a tread wear of 200. Great dry pavement grip and decent in the rain, up to about 1/2 tread. They do wear out quickly, though, particularly with the help of 6-8 autocrosses each summer.
A tire with a 140 treadwear runs in the race tire class where I autocross!!
Dave P