5,000 mile update for my 2021 SR+ LFP (5,519 miles actually). As of today, the Tessie app shows a battery capacity of 54.5 kWh (down 0.2% from my original 23 Oct 2021 post of 54.6 kWh), and a max range of 252 miles (down 0.4% from my original post of 253 miles).
So at 5,500 miles I've had very little degradation, which I don't even really think is degredation. If you look at the graph, battery capacity and range start to drop at the same time the weather here started getting cold. My car is now being exposed to 35-45 degree F temps, which I think is the primary reason for the drops in capacity and range. I expect these drops to continue as the weather gets colder, and then I hope to get at least some of that back when when temps rise again next spring.
According to the car's screen, I'm now averaging 208 Wh/mi over the life of the car. I'm guessing the car isn't using the battery buffer in its calculation--but I don't really know for sure. But assuming the Model 3 has a 4.5% buffer (according to multiple threads), that would make my 208 Wh/mi actually 217 Wh/mi (208 * 1.045 = 217; please correct me if I'm screwing up the math). Assuming I could tap into the listed 54.5 kWh battery at 217 Wh/mi efficiency, that gives me a range of 251.2 miles.
My charging is almost entirely Level 2 from a Grizzl-E on a 40 amp circuit in my garage, delivery 32 amps to the car. I charger every night, but I mix it up to try and let the battery sleep at various states-of-charge. So some nights I'll charge to 70%, some to 80%, some to 90%, and at least a couple times per week I go to 100%. I've used Superchargers a few times, but mostly just to check out the stations in my area.
Tessie says I've charged 66 times in the 57 days I've owned the car. The LFP battery is supposedly good for 5,000 cycles before it degrades to 80%, I've used 1.3% of those cycles since I bought the car on 23 Sep 2021. At this rate, the car should last a total of 12 years before the battery falls to 80% capacity (202 mile range).
EDIT to add one more metric. Tessie says I've spent $124.88 on electricity for the life of the car, while the same driving in my old Ford Focus would've cost $500.02 in gasoline. So my fuel costs have been 25% compared to keeping my old car.
I'll try to post another update at 10,000 miles, which should happen during the coldest part of the year, so I expect to see more dropping numbers.