Just got back from a 1600 mile round trip. The autopilot works well on the highway and I noticed that courtesy has been programed into the system. In the past the car would get into the left lane and just stay there, now if a car is close behind, ego moves to the right lane without being told to. It's not always the best move but it is a kinder car now. I did two roundabouts, it worked well on one but not the other. I'm not sure why. There are some behaviors that I had not considered before as problems until I found myself in a unique situation. I was stopped on the interstate because of a left lane closure about a half mile ahead of me and I got into the right lane in advance of the closure, after being in the slower right lane and with a still empty left lane the car, correctly, saw the empty left lane and tried to get into it and pass the stopped traffic. So the autopilot works very well in stop and go traffic as long as all the lanes have traffic in them.
The trip up and back took about 11 hours, with stops, each. The car drove most of the interstate except when there was heavy rain and, correctly, slowed down for safety reasons. I believe it was to conservative in some of its speed choices and I drove at higher speeds.
This may not be part of the FSD discussion, however I think it deserves mentioning, I understand the logic behind stopping to charge more frequently, in theory it reduces charging time and thus total trip time, however, the time lost getting on and off the interstate and possibly waiting for a charger not to mention the additional stress, I think, should be reconsidered by Tesla when planning trips. I would prefer to charge longer and make fewer stops.