since you are plugging in, I would consider wiring an outlet for a conventional 120V heater in, and set it up with a timer. At least you could preheat the car for the morning commute, and if you get to plug in you could do the same for the way home. IF you ran a heater at 500 watts for a half hour before you depart it should get nice and toasty with no wind chill losses.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
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