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I have also noticed as high as 15KW (momentarily) while preconditioning. There are two 7KW electric heaters. I only charge the car when needed, it's not kept plugged in. As the car has instant heat, I've not yet felt the need to precondition (garaged in NJ). The extra energy use from the battery to condition the car while driving is insignificant unless the beginning of a long trip.
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