Is 777 more fuel-efficient than 747?

Summary. The Boeing 777X is considered the aircraft of the future, with fuel efficiency and capacity that make it suitable for high-demand routes. While the Boeing 747 carries more passengers and has a longer range, the 777X surpasses it in cargo capacity and fuel efficiency.



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A Boeing 747 filled with passengers to only 75 percent capacity is more fuel-efficient than an automobile with a driver and one passenger in terms of fuel burn per passenger mile. Hard to believe, isn't it?

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According to Boeing's data, the 777-9 has a total length of 251 feet 9 inches (76.72 meters). The 747-8 is just a bit smaller at 250 feet 2 inches (76.3 meters). The 777-9 is the longest commercial aircraft ever built.

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To start the Boeing 777 vs 787 comparison, we must say that the 787 is a more fuel efficient aircraft than the 777 thanks to its use of composite wings and more aerodynamically efficient design.

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CBS News reported that, based on the expert opinion of a former Boeing 777 captain, Flight 89 would have likely dumped 15,000–20,000 US gallons (12,000–17,000 imp gal; 57,000–76,000 L) of fuel. Shortly after completing the fuel dump, the aircraft landed safely.

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A Boeing 777-300ER has a full fuel capacity of 47,890 gallons and burns fuel at the rate of roughly 2,500 gallons per hour (depending on the conditions, such as winds aloft and takeoff weight). A typical flight from New York to London on the Boeing 777-300ER would then cost around $33,000 in fuel.

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The 777 also became Boeing's first Fly By Wire aircraft, meaning that the controls' surfaces on the wings and tail were operated by electrical signals sent “by wire” from the controls in the flight deck. The cabin was engineered to be roomier than other aircraft.

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Can a wide body airliner land with a full fuel tank? Yes! But it is safer to land an aircraft below its published MLW. Using the B777-200 as an example.

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Fuel use depends on many factors. Weight is just one. Assuming all factors remain constant except weight, a heavier aircraft will use more fuel than a lighter aircraft. For example, an airliner full of passengers will require more fuel to fly the same distance than when it is empty.

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The Bottom Line: The Airbus A350-900 and Boeing 787-9 are very similar aircraft, suited for similar missions. As one would expect, the slightly larger A350-900 has a seat-mile cost advantage, while the 787-9 has an advantage in cost per block hour. These aircraft are competitive, and nearly tie in economic performance.

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What makes the plane so expensive? The 777-300ER can carry 365 passengers compared with the 787-9's capacity of 280. The GE engines on the 777 model develop 62% more thrust than the 787's two engines. The plane is also longer than the Dreamliner, has a greater wingspan and a greater wing area, and is taller.

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