[sandworm101]

Some cycle on and off but the ones on my building don't. A 50/50 on/off cycle is still going to keep the engine warm enough.

The truth is that modern engines/oils/batteries do very well in the cold. A battery heater is probably of more use than a block heater. But I like having the conventional outlets whenever I have to work on my car. A Tesla fast charging point cannot power my vacuum cleaner.