That’s interesting about the Audis with aux heaters as recently as the 1990s. To me it seems like a very acceptable fix for the EV heater problem. I’m sure the Tesla engineers could integrate it nicely into the design.
And make no mistake about it, that was a *very* high end sedan. “Like a linebacker in a business suit” was one of my favorite summaries of that car. All-aluminum unibody, handled well, was rigid as could be, and fast for the time.