[Scoundreller]

Are your outlets continuous?

I’ve heard of ones that cycle through different chunks of the lot, so half (or a third or 2/3) are powered at a time.

[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.