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Loss of range in winter is mostly due to early compliance car EVs using electric resistance heaters. My Spark EV uses about 1/3 of the battery to supply a modest amount of heat. On the other had running the A/C in the summer only consumes about 5% of the battery on the same commute. The Bolt and all modern EVs use a heat pump for HVAC which is MUCH more efficent than resistance heating. Problem solved.
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