As most of us know, the range meter takes the usable kWh in the battery and divides it by a constant to display the range remaining. That constant was the EPA value when I bought the car, and today I attempted to check whether the constant had changed.
Method: the general idea is to take a drive and divide kWh consumed by distance as displayed by the range meter. In order to reduce rounding errors I started and ended the test just as the range meter dropped a digit, and for kWh I reset a trip meter at the start of the test and then calculated the kWh as measured distance traveled * the Wh/mile displayed. Since the trip meter has one sig digit and my test was measured at 15.5 miles, the inaccuracy is ~ +/- 1/300 in both the distance and Wh/mile numbers. All told, ~ 1%
Results:
If I recall correctly EPA is 227 Wh/mile for my Model 3 LR. Presuming my memory is correct, this is good evidence that the constant is unchanged.
Method: the general idea is to take a drive and divide kWh consumed by distance as displayed by the range meter. In order to reduce rounding errors I started and ended the test just as the range meter dropped a digit, and for kWh I reset a trip meter at the start of the test and then calculated the kWh as measured distance traveled * the Wh/mile displayed. Since the trip meter has one sig digit and my test was measured at 15.5 miles, the inaccuracy is ~ +/- 1/300 in both the distance and Wh/mile numbers. All told, ~ 1%
Results:
- Range dropped 22 miles
- 15.5 miles and 316 Wh/mile per the trip meter
If I recall correctly EPA is 227 Wh/mile for my Model 3 LR. Presuming my memory is correct, this is good evidence that the constant is unchanged.