How much fuel does a Boeing 777 consume per km?

The long-range 777–200LR burns 7.56kg/km and 3.25L/100km per seat. The 777–200ER burnt 6.95kg/km and 2.9L/100km per seat. The -200 burnt 6.83kg/km and 2.81L/100km per seat. Note for the 777F, it is based on the 777–200LR fuselage, the fuel burn varies on the amount of freight present in the aircraft.



That’s an excellent question, but the answer isn’t a single number. Fuel consumption for a Boeing 777 varies dramatically based on several critical factors.

Instead of a per-km figure, it’s more accurate to think in terms of a range and understand the variables at play.

Here’s a detailed breakdown:

General Consumption Range

  • Per kilometer: A typical figure is approximately 9 to 11 liters of fuel per kilometer (or about 2.4 to 2.9 US gallons per km).
  • Per seat per kilometer: A more efficient measure is per seat. Modern 777s achieve roughly 2.5 to 3.0 liters per seat per 100 km (or 0.66 to 0.79 US gallons per seat per 100 km). This highlights its efficiency when carrying hundreds of passengers.

Important: These are broad averages. The actual burn for a specific flight can be much higher or lower.

Key Factors Affecting Fuel Burn

  1. Aircraft Model & Engines:
    • 777-200ER: The earlier, shorter-range variant.
    • 777-300ER: The most common long-haul workhorse. It burns more per hour but carries more passengers, often making it more efficient per seat.
    • 777-8 / 777-9 (777X): The new generation with composite wings and advanced GE9X engines. It is significantly more fuel-efficient (up to ~10% better than the 777-300ER).
    • Engine Choice: GE, Pratt & Whitney, or Rolls-Royce engines

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