Only about 20% of your fuel goes to move your car. The rest goes to heat up the great outdoors. Assuming your car weighs 1.59 tonnes (1¾ tons) and you weigh 90.72 kg (200 lbs) only about 1% of your fuel goes to move you. Obviously, there is lots of room for improvement, primarily by making cars lighter.
I suspect the day will come when you summon a driverless car, exactly the size needed to hold the passengers and cargo.~ Roedy (1948-02-04 age:70)