How Fuel Efficient Is An Airplane ?

How much fuel does a 747 need to complete an international flight? How efficient are these aircraft? Join Cristen as she asks how much fuel an international flight actually uses.

How do they measure ?

Aircraft must consume fuel to supply the energy needed to move the vehicles and their passengers. Fuel economy is a measure of how much fuel an aircraft needs in order to operate, and it can be expressed in several ways,

for example by the liters of fuel consumed per passenger per kilometer. Aerodynamic drag, which exerts a force on the aircraft in the opposite direction from the velocity, is a principal determinant of energy consumption in aircraft because they operate at such high speeds.

Source : Brain stuff ,

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