62.32 mi and used 62.55 mi of 'rated range'. During that drive, I used 13.84 kWh. That all boils down to 222 Wh/mi (139 Wh/km). Sorry I don't have a screen shot.
These sound like they might be TeslaFi numbers (I don't know). For reasons unknown, the "used kWh" from TeslaFi cannot be trusted. The miles traveled and miles of rated range used and % used can be trusted (within the rounding error). The kWh used can be scaled in TeslaFi via a configuration setting if you wish.
I'd expect that you'd see a constant of closer to 226Wh/rmi rather than the ~221Wh/rmi that you got (though it is within the range of what could be observed), and I suspect TeslaFi data issues. This will screw up your projections of your pack capacity.
It's easy to check the kWh used data in TeslaFi of course - just take a picture of your trip meter and compare to TeslaFi next time.
List of current constants (prior to 2019.36.1 range increase update), and the position of the solid line on the Energy Consumption graph:
AWD: 250Wh/rmi solid "rated" line, 245Wh/rmi charging, ~230Wh/rmi discharge (228-234Wh/mi observed), CAN bus BMS 234Wh/rmi
LR RWD: ~239Wh/rmi solid "rated" line, 234Wh/rmi charging, ~223Wh/rmi discharge (?), CAN bus BMS ? (223Wh/rmi?)
LEMR: 242Wh/rmi solid "rated" line, 237Wh/rmi charging, ~226Wh/rmi discharge (?), CAN bus BMS ? (226Wh/rmi?)
SR+/SR: 224Wh/rmi solid "rated" line, 219Wh/rmi charging, ~209Wh/rmi discharge (?), CAN bus BMS ? (209Wh/rmi?)
"?" Indicates unknown/guesses. Discharge constants do have small variation due to environmental and discharge conditions and other factors, but are generally predictable enough to be useful.
Again, these constants may well CHANGE with 2019.36.1, especially with the latest efficiency improvements, if the "100% charge" rated range changes as a result of the software update.
My best current understanding of the formulas (subject to revision upon provided solid evidence):
Range Projection Formula on Energy Screen:
Projected Range = (Rated Miles Available *
Charging Constant) / (Current Selected Efficiency Metric) (When in averaging mode)
Actual Achievable Range (to 0 rated miles, not using any reserve) at a Given Consumption:
Range = Starting Rated Miles Available *
Discharge Constant / (Average Wh/mi Achieved on Trip Meter)
Full Battery Capacity (CAN Bus):
Battery Full kWh = Rated Miles @ 100% * BMS Constant + Buffer Size (Wh) (Buffer Size only available via CAN read, typically 3.3-3.5kWh
for AWD)
Current Battery Energy (CAN Bus):
Battery Available kWh = Rated Miles * BMS Constant + Buffer Size (Wh)
Available Energy Before 0 Rated Miles (CAN Bus):
Avail kWh
Above 0 Rated Miles = Rated Miles * BMS Constant
Available Energy Before 0 Rated Miles (Trip Meter):
Trip Meter Avail kWh = Rated Miles * Discharge "Constant" (Note this may be somewhat less than battery available energy)
Energy Required to charge vehicle as shown on charging screen:
Charge Energy = Rated Miles Added * Charge Constant (Note this is considerably higher than the "used" energy)
