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Does the car draw power for pre-warming when charging is scheduled?

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Maybe this has been answered already. If so, I couldn't find it. With the car hooked up to the HPWC during the day but scheduled to charge only at night, will it still draw power from the HPWC if we start pre-warming the cabin or is it drawing that power directly from the batteries?

I'm just wondering how much the scheduled charging feature actually impacts power use during the day if the car is still hooked up to the HPWC. I'm hoping it draws what it needs from the wall even if the actual charging is scheduled at night, but can anyone confirm that?