I think this is possible if the Tesla’s electricity is coming from burning coal, which produces ~double the CO2 emissions per unit energy compared with gas. (Th

I think this is possible if the Tesla’s electricity is coming from burning coal, which produces ~double the CO2 emissions per unit energy compared with gas. (Though this seems annoying to actually calculate, so I haven’t.) You would not be looking at efficiency from a energy/$ perspective, which is what industry power generators care about, but rather energy/ton of CO2, which they rarely care about.