From the dashboard, and the Tesla BMS is fairly accurate as long as you allow it to calibrate at 100% charge occasionally. I have also not seen a noticeable ch

From the dashboard, and the Tesla BMS is fairly accurate as long as you allow it to calibrate at 100% charge occasionally. I have also not seen a noticeable change in my range for actual long distance driving over those years, and I do occasionally stretch it to near its full range. The biggest change was putting wider, higher-performance all season tires on after the factory eco tires were worn out. Still I mostly noticed that efficiency change by tracking my stats on trips. There wasn’t really a noticeable difference from the drivers seat.