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Some more stats:
1. I am pretty high up (just over 60 deg North), but no real winter this year so no stats for -20 degrees C.
2. My consumption has mostly been close to 40, sometimes at best below 30 kW/100km; these numbers are in the -3 to +3 degree C temperature range. Note that these can be directly calculated from the 21 kWh capacity and observed kilometer range.
3. I use preheating daily with preset time and start with battery at 100% as the heating comes from the wallbox.
4. Preheating with battery is also fine and works even at less than 20% capacity at start -- previously some have suggested it needs to be at least 40-50% full. It uses maybe 5 to 10 % of max capacity, depending on how long you preheat.
5. I get decent results even with just a few minutes of heating, wallbox or battery. The air in the car is warm although the seats are still cold and need seat heating.
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