Cute. When see responses like this I know there is little behind the keyboard.
In statistics, it called a step event, it's not a line, but then again everything looks like a nail to this thread. What happened at this point?
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I hope my response was useful to you. However,
@Dave EV 's point was that initial capacity loss tends to be steep, and then it levels out. That's just what is always seen, in aggregate, for EVs. (There are of course exceptions for individual vehicles.)
Regarding this step you see: No one outside of Tesla knows exactly how the BMS in the Tesla works. However, it's periodically determining the "CAC," calculated amp-hour capacity, and adjusting the range based on the minimum value of this in your bricks (each brick has a different CAC, but the minimum CAC brick limits your pack available energy since they are in series). How often this is updated is unclear, and how it adjusts is unclear. My impression is that it often tends to make "step changes," for whatever reason. Whether that is because they build in some sort of hysteresis, or long-term averaging, I do not know. What I do know and have seen myself is that I saw these step changes (on the order of 1-1.5kWh), which are likely not exactly physical, but rather represent a periodic "update" to the state of your pack - meaning you might have been gradually losing capacity for a bit and then the BMS updates its estimate and you "see" it.
However, the BMS algorithms and update methods are always changing, so what I saw with my car 1-2 years ago when I was losing capacity, may no longer apply (in addition you have a different battery type). I saw step changes of about 8 miles at a time, and have settled on about 285-290 miles at a full charge. And it's been there for the last year or so (I don't quite recall exactly and I stopped using monitoring software). (About 10% loss.) I expect further loss over time - to what level I have no idea.
Your capacity loss to me looks normal (to me it also looks like you started a bit below average, which is also normal, for the people who start below average, haha), and it will also likely slow down eventually - you may have an additional 5-10% to go though. No one knows since the 2170L packs are new and may have different characteristics.