I have had my Model S for a little over a month now. It is an 85D with autopilot, and I love it. The autopilot is my favorite feature as I drive home in traffic almost every day, and that is where I get the most benefit out of it so far (I have only taken one trip on the interstates to date.) I have set the following distance setting to the max, but I still find the autopilot in traffic to be "clunky". Is there anything I can do to smooth it out even more? I also find that when traffic is moving it is a bit abrupt in the curves in the road (I only use it on the highway). I notice that when I drive it I can routinely get 50 or more less wh/mile on average. If I were taking a trip where I really needed the range, I think I would be afraid to use it for fear of having to stop more often.