Fuel Burn A/c vs Automobile
Today a passenger asked me a question about the fuel consumption of the aircraft vs that of a car (I'm a Cabin Manager with a UK airline). I told them that our miles per gallon were more efficient than a car, but later wondered if this was accurate.
Is there any way of working out, on a 757-200 operating a 2 hour flight what the (approximate) burn per mile per pax is, in terms of either gallons or litres (just in case I'm ever asked again). I appreciate that the answer will be infinitely variable, subject to winds, temp, route and altitude, but a rule of thumb answer would be welcome.
Thanks for any help that may be available.