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Your worst EV mileage will be a string of short trips where the cabin can need max HVAC each time you start up for the next leg. Lots of watts being consumed while not moving! Unlike an ICE where there's lots of waste heat, that isn't the primary heat in the X5 45e.
It's best if you can leave after setting a departure time. That way, the batteries can be warmed as well as the cabin while plugged into the EVSE. Warmer batteries are able to source more power as the electrons can move more freely when the battery is warm.
Preheating the cabin, depending on the EVSE you have, might not be able to keep the battery fully charged, as, especially in the US if you're using the supplied 10A device, that might not be enough to keep the battery fully charged while warming or cooling the vehicle.
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