As pointed out by ‘Manly Warrior’, oil/gas/diesel has the highest weight-to-energy ratio of any envisioned power source. In addition to this, is the fact that our technology to reduce tailpipe emissions constantly improves. An emphatic example is the fact that I drive a diesel (TDI) car that does not make black clouds when the pedal is pressed.
The best base power, least polluting chain leading to transportation nirvana would be nuclear power station creating H2 feedstock leading to ‘gas stations’ allowing individuals to fuel their vehicles in the same time frame as current petrol vehicles. Fuel cell technology is minimally polluting while electric drive trains seem only to be improving daily.
He does not tell the complete story. The energy density of LNG is one-half of gasoline. You would have to burn 2 gallons of LNG to travel the same distance provided by 1 gallon of gasoline. That makes the cost per mile about the same. You would also need a gas tank twice as large to hold the LNG. They never tell you that.