Today, -3c this morning, used the preconditioner, windscreens and side windows clear, heating wheel heated and 24c in the cabin. Achieving around 3.7 miles per kWh, which equates to 237 miles, not prepared to compromise on comfort. The car is telling me it has 232 miles of range left at 75%, which does not equate so its a question of knowing how the car works. The thing is if I start up and turn on the heating the range falls to 178, which tallies up with the 237 miles.