Indeed efficiency of a modern ICE engine in a car is 25% max in ideal conditions, while a modern industrial turbine powered by natural gas can get 60%. In fact

Indeed efficiency of a modern ICE engine in a car is 25% max in ideal conditions, while a modern industrial turbine powered by natural gas can get 60%. In fact even with coal the amount of CO2 will be smaller per distance driven. The efficiency of the latest coal power stations is about 48%. With this and accounting for significant energy losses to refine gasoline from oil the electrical cars are already greener than gasoline or Diesel engines unless one use the energy from very old coal plants with low efficiency.