According to my knowledge current car motor efficiency is about the same than power plants: gasoline car motor 40%, diesel car motor 43%, coal burning power pla

According to my knowledge current car motor efficiency is about the same than power plants: gasoline car motor 40%, diesel car motor 43%, coal burning power plants 30-45%, gas burning power plants around 30% efficiency. All numbers are from Wikipedia. But even if power plants would be more efficient (meaning producing more energy for the same fuel input) it still would make no difference from a CO2 emissions point of view after all fuel has been burnt...