Also heard that if every pax in a 747 took a car to cover the same distance instead of flying, the 747 burns less fuel. I know I dont have any numbers but i can believe it. Airliners are only getting more efficient. Aircrafts these days (777, A330...) burn 30-50% less fuel per passenger then older aircrafts (707, DC-10...).
Just thought I would mention this.
