When I took delivery of my P90D, a 90% charge was 252 Rated Miles. This was firmware 2.20.45. After the upgrade to 2.24.30, the 90% charge dropped instantaneously to 246 Rated Miles. After the upgrade to 2.36.31 (the minor update immediately before 8.0), the 90% charge dropped again to 242 Rated Miles. The car is only a few months old; it seems unlikely it has actually lost 10 miles of range already. And these step changes only happen immediately after firmware updates. It feels like Tesla is changing the RM calculation in the firmware. Any ideas on what's happening here?