That's what breakdown companies (like the AA and RAC in the UK) do. It's slow enough that you'd only want to use it to get just enough juice to get to a proper charger, though - they use 3.5kW or 5kW chargers: https://www.rac.co.uk/drive/news/rac-news/rac-begins-rolling....
I'd imagine it's way less efficient and way more polluting than using the national grid, too.
I'd imagine it's way less efficient and way more polluting than using the national grid, too.