I've been watching my charges carefully for the past year, and it's been incredibly consistent. I charge with NEMA 5-20 all day at work because it's free and almost always available. I used to consistently pull 16A @ ~114V, and close to the end of the day the API would usually read a charge rate of 4.5 mph, and if divided the rated miles gained by the time charged, I would get a very consistent 4.56 mph, day after day after day. Sometime in July the behavior changed, all of a sudden I'm getting 7% less charge rate, even though the car claims it's pulling the same 16A @ ~114V. I can't pin this down to a single software update, because I didn't have the car for a couple weeks as it bounced between the body shop and Tesla service. So I emailed ServiceNA a couple weeks ago and I've been basically stuck in a tier 1 tech support loop between them and my local service center unable to get a clear answer about what happened and if it's just my car or everybody. "Well the logs look fine", "110V charging is just a backup", "with spec", etc, is all I get. So frustrated what I did eventually was I used multiple meters to confirm what the car was drawing, and surprise, the car is drawing 1A less than the chargers claim it is! Losing 1A/16A basically drops you 7%. It gets even worse if you use NEMA 5-15, because now you drop 1A/12A! With auxillary overheads, I except 12A charging to have dropped by a full 10%!!! when charging at 40A it's not such a big deal, because it's only 1/40th. I even have a workaround: I can use my custom NEMA 14-50 to NEMA 5-15 adapter, turn the charging amps down to 16A, and voila, we now have 4.56 mph charging again. Amazing. So this seems like a software regression to me, because in any case, the car should not claim it's drawing x/x amps, when it clearly isn't. If they reduced it by one amp for some safety reason or whatever, then it should just report the right number. Can anyone else confirm this?