Why does Wh/mi or Wh/km sometimes differ from what is shown in my car?

Energy consumption (Wh/mi or Wh/km) is shown both in TezLab on the Drive screen, as well as in your car. This figure, however, is not one that can be read directly from the vehicle. As a result, the value in TezLab is an estimate based on the charging history of the vehicle, the range/energy added during recent charging, and the range/energy used while driving.