Originally Posted by pistongone
An interesting calculation in regards of cost is the pasenger mile per litre. If you take the cruise speed, multiply by number of passengers and divide by fuel burn in litres you get the amount of fuel to move each pax a mile! So consider a Cherokee Six. 60ltrs/hr six up and doing 135Kn @6000' 135 x 6= 810 passenger miles. Divide by litres and you get 13.5 passenger miles per litre. This plane is the cheapest i have found for touring, but it does need to be atleast 4up to make it pay.
Mooney M20J 160 kts at 9.9 USG/hr at FL100. 4-up that's 17.0 passenger miles per litre.