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Here's what I do
I have an Exped Megamat 10 inflatable sleeping mattress which goes with me on long trips so I nap at the tesla superchargers on what si something between a queen and a full sized mattress 52" x77.75" ( but actually the usable space is more like 60" wide so it really is like a queen .
I run my rear view camera ( no need to use the rear view mirror) and fold that mattress up to make the wall stopping a few inches from the back . I also preheat the cabin on high to 108 degrees (I'm out of the car) to preheat the interior body panels for residual heat when driving.
I also use evannex Heat shield and all windows are covered and top roof glass and falcon wing door glass except for my windshield and side windows .
I then can drive for about 75 miles without turning on the 20 degree weather. I use my seat heaters as it starts to get a bit chilly and after 100 miles I cave and run on the heat as my windows start to fog anyway by then.
Sometimes I fill a MSR dromedary bag (10 liter) half full with hot water , which I out on my lap or behind my back and toss a light weight Rumpl down blanket atop that - makes a heated cocoon on top so heat is now all around and so the heat barely has to be on. At the next Supercharger which is likely in the middle of nowhere I can quickly reheat the water with my camping stove to make hot cocoa or cook some vegetables while I'm waiting to recharge.
To avoid getting into too hot a car after it is preheated I quickly vent the car when I get in by opening the falcon wing doors - the heat by my head flows out quick and whatever coat I was walking in outside while charging , has enough cold air and chill on it so I don't overheat at all while it starts to warm up thanks to thermal lagtime. And by the time it has warmed up, the car is already starting to cool down.
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