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An airplane like a Boeing 747 uses approximately 1 gallon (about 4 liters) of fuel every second. Over the course of a 10-hour flight, it can burn 36,000 gallons (150,000 liters). The 747 burns approximately 5 gallons of fuel per mile (12 liters of fuel per kilometer).
That sounds like an awfully bad mileage-per-gallon rating. But consider that a 747 can carry up to 568 people. Let's call it 500 people to make the math easier. A 747 is transporting 500 people 1 mile using 5 gallons of fuel. That means the plane is burning 0.01 gallons per person per mile (5/500). In other words, the plane is getting 100 miles per gallon (42 kilometers per liter) per person! Not bad when you consider that the 747 is flying at 550 mph (900 km/h).
The reigning champion of the world's largest jet aircraft, the Airbus A380, is even more efficient. The multi-story jumbo jet burns an average of 4,600 gallons (11,400 liters) of fuel per hour. That's slightly more than the 747. The A380 can also carry more than 800 passengers at full capacity. That's about a 20% increase in fuel efficiency per passenger over the older 747.
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