In the world of cars not into production ? Yes - this Mercedes with .17 drag is crazy efficient. Isn't the other not-in-production car even more efficient? The aptera? at .13? oh wait .... it only has 3 wheels so it's a motorcycle. That said, regarding the side view mirrors instead of cameras offset by the amount of electrical draw to run cameras was an interesting take. There's a not very scientific experiment done with parasitic loss here; Here’s how much battery is drained if a Tesla is left unplugged for 32 days - Tesla Oracle In short - This woman's experiment shows that a relatively efficient car will lose close to ½ % of it's charge per day over a month (from personal experience w/ parasitic loss - it's not really linear but happens mostly upfront & slows as time goes by). The experiment doesn't account for higher drainage if a car has to protect its traction pack from excess cold or heat. More of just ideal temperatures shown here. .