I did see some odd range behaviour on my 2016 90D Nose Cone:
Rated Range at 80% SOC has been a very stable 345 km (216 miles) since I got the car two years ago, which would equal exactly the 270 rated miles the car had when new. We rarely drive the car until almost empty, so I got a positive but kind of unexpected surprise when I did this weekend. My wife forgot to plug it in on Friday so I started driving with a battery that was only at 20% charge.
I had expected to need a stop at the Super Charger, which I did not need, the car "found" increasingly more range over the day. When I parked the car at the end of the day on Saturday, it had driven exactly the 345 km (216 miles) since the last charge to 80% that should have gotten me to 0 km remaining. However, I still had 70 km (45 miles) remaining range, with a total of 64.9 kWh used. At around 19 kWh/100 km, that means that roughly 12 kWh capacity still remained in the battery.
And here things kind of stop adding up. I had charged to 80% and got a total of about 77 kWh out of that. Which means that 100% would equal 96 kWh - which does not make sense for a 90D. Did I overlook something or is the BMS wonky here? By the way, after recharging to 80% the car again claimed 345 km of range at 80%. I have no clue if the car still has its original battery or what the exact battery type is. I bought used from Tesla in 2020 and they would not share the service records with me. The car has 85,000 km (approx 53000 miles) on it.