I know at least one case when an owner successfully charged his S85 by towing it in a Drive mode. The owner reports that in about 20 minutes of dragging the car he recovered about 30 miles, which allowed him to successfully return home. This was an emergency of course. I wonder if this an acceptable way to charge the car from the technical perspective. How does the car distinguish this from, say, going downhill? Another question is regarding warranty. Do you think Tesla would object this kind of stunt?
P.S. I'm aware of a similar thread on TMC. It's pretty old and there was some guessing but nothing concrete.