Heywood confuses power (MW) with energy (MWh). A gallon of gas has the equivalent of 33kWh of energy. He also fails to explain how inefficient an IC engine is. A full 10 gallon tank of gas holds 330kWh.  For an average car, that is enough for a 250 mile range. A Chevy Bolt has the same range with a 60kWh battery.  An IC engine can never be that efficient.