I have a 2012 P85. I've had steady, but slow degradation, perfect acceptable. A daily charge (used to be called 90%, but whatever the line is at the top of the daily range is what I use), would get me about 225-230 in rated range at this point. Suddenly, in the last week, it dropped to 195-200. I called my local service shop and the fellow said it's related to a recent software update, and there was one a few days ago, that changed the algorithm to apparently account for my driving habits. In theory, the range is now closer to what I should get based on my driving history. Ok, that's great, that'd be a nice option (I thought the energy graph could do that for you, but I haven't looked at that graph in years). The problem is now I have no idea what my actual degradation is. He says there is no way to revert the change and no option to use the old algorithm. There's no way for me to now see the objective EPA rated range, only the subjective range. I asked him to relay up the change this is a terrible decision. If I go to show off my car and someone asks about degradation, I have no way to show them my real degradation (or lack thereof). When I fully charge, I'm going to get a shocked look when they see I'm 30 miles or more off of the Tesla touted 265 my car had. If I try to sell my car, I have NO way to show them the real degradation, just a "take my word for it, it's not as bad as it looks". I also have no way, in the event of an actual sudden degradation problem, to prove that's what the problem is. I'm going to have to fight with Tesla to get them to believe that the value isn't normal. Who knows, I might have a real problem, but Tesla can just wave their hands and say "algorithm adjustments". So, anyone affected by this same issue, I encourage you to make your voice heard by Tesla that this is a terrible decision. At a minimum, I should be able to see what my real degradation is. I'll be digging around in settings screens, hoping to find something to show me a real value, but the service fellow didn't seem to think there was one.