Ok, I'll try to come up with some very round numbers and see what happens.
These will be for a 767-300.
Fuel burn 6000kg/hr=8300ltr/hr.
Cruise speed=1000kph.
So we're burning 8.3ltr/km.
If we have 200pax that's 0.0415ltr/km/pax.
Where I come from we measure fuel efficiency in ltr/100km. A good car might do 8ltr/100km, the aircraft is doing 4.15ltr/100km per passenger, making it about twice as fuel efficient as a car. That is a car with one person in it, put four people in the car and the car becomes twice as fuel efficient.
I'm way too lazy to look up how many litres in a gallon etc, so you'll have to work that out for yourself.
Meanwhile I'll just wait for someone to prove me totally wrong
