Where did you get that information? I just searched it online and the first results say about 33% efficiency for coal plants and between 25% and 30% for gasoline engines.

I’ll edit my coment in a few minutes with the links to my sources.

edit: those efficiencies are energy efficiencies, completely unrelated to emmissions. I did not find any sources for emmissions efficiencies, but I’d guess knowing the energy efficiencies that coal is worse for the environment than gasoline.

edit 2: Coal power plant efficiency: https://www.pcienergysolutions.com/2023/04/17/power-plant-efficiency-coal-natural-gas-nuclear-and-more/

gasoline ICE efficiency:

https://www.fueleconomy.gov/feg/atv.shtml

here it says that the engine losses go from 64% minimum on roads to 75% maximum on cities.