(AT/No cooler) I run around 240 normally, or up to 250 on the highway (sustained ~80-85mph). I don't run in DS mode much, but it's usually ~5deg higher than in D. The hottest I saw was 260 after about 30min of 110-120mph. Outside temps have been around 70-80deg so far. It looks like the car is still in control and adjusting the temps itself, but I don't want to find out where it fails.
It won't be 1-for-1, but when the outside is ~100, I would not be surprised to see 280 at high (road) speeds. There's almost no chance I'm going to spend any real time on a track until I get this resolved.