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Another thought; the engine has a lot of residual heat.
Keep the water tank in the garage, connect it to the secondary cicuit of a heat exchanger that gets fed from the coolant system and run the pumps on both the car and your water tank to harvest it.
Next morning, when the car is freezing cold and your storage tank inside the garage is warmer, do the same again to preheat the car...
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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 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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