If you’re looking for today’s cars with the lightest environmental footprint you should be looking for charge ports, not fuel tanks.
Why? The energy efficiency of electric motors is fundamentally better than that of gasoline engines; and if you consider how rapidly the U.S. electrical grid is greening due to more sustainable sources like solar and wind, the advantages are going to keep building over the years you drive the vehicle.
You won’t find fuel-stingy icons like the Toyota Prius on this list. Some of the greenest cars such as the Tesla Model 3 Performance and its 3.2-second 0-60 mph