I wonder if a fuel cell heater could be of use.
The electricity could ideally run a heat pump to achieve a thermal efficiency of more than 100% overall.
Or it could recharge the car while preheating it.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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