I'm really curious what others are experiencing as far as charging speed. When I got my car in mid-December I was getting around 16-17 mph charging at 40 amps with a single charger. Lately my car seems to be getting more like 21 mph on the same NEMA 14-50 outlet in my garage. The Tesla web site states that we should get "up to 31 mph" under these conditions. I regularly check the charging status of my car and it always seems to be running at 21 mph and 40 amps. I was at my service center this week and pointed that out to my Service Mgr. It just happened that he had a car charging as we were talking, and it was showing 21 mph, 40 amps, just like mine. He said that is typical of the rate he sees on their 40 amp plug, and is also curious as to the stated "up to 31 mph" claim. He said they are supposed to get a HPWC soon and will see if that changes anything with single charger cars. So, what are others experiencing?