Sorry for the slow reply here, but I can tell you I am very satisfied with the Continental Extremes on the front. But the better news is that on the rears I have Michelin Pilot Sport A/S plus from Costco! Great tire and great price. Not only have I raced them in the 1/4 mile and beat a few Porsches, after the first 11K miles or so, when they wore down, the warranty kicked in and I got a replacement pair almost for free! Who can top that?
So with 26K miles now (stock Yokos replaced after about 8K), I still have plenty of tread, as confirmed at my 24K "tune-up" last week. Tesla NYC staff is pretty impressed...
Hope this helps.