Having the IMA and phev vent into the cabin does help, but it takes over an hour for that to build. I use to use one of those small 300 watt accessory plug heaters when I had to wait for a ferry an hour a day. It wouldnt heat the car, but kept the temp comfortable with the engine off. Too much of a load and it takes from the mpg as the engine has to put it back into the ima battery.
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