CO2 emissions from the gasoline does not account for the energy necessary to refine the oil to produce it. These days refineries use electricity for that so if

CO2 emissions from the gasoline does not account for the energy necessary to refine the oil to produce it. These days refineries use electricity for that so if that comes from a coal plant, it adds like 25% of CO2 emission. So the best sedan is pretty much equivalent in the carbon emission to Tesla when that car uses electricity from an old coal plant with 30% efficiency.