The Concorde carries about 119,500 liters (31,569 gallons) of fuel and burns about 25,629 liters (6,771 gallons) per hour in the air. But fuel isn't just for flying. It's also used to balance the plane.

Yes, the Concorde was notoriously inefficient by modern standards, consuming a staggering amount of fuel to maintain its supersonic speed. It burned approximately 25,629 liters (about 6,771 gallons) of fuel per hour, which is similar to what a Boeing 747-400 burned while carrying four times as many passengers. While a modern Airbus A350 or Boeing 787 achieves 60 to 80 passenger-miles per gallon, Concorde achieved only about 17 passenger-miles per gallon. A significant portion of this fuel was used before the plane even left the ground; it could burn up to 2 tons of fuel just taxiing to the runway. During takeoff and the climb to supersonic speed, the engines used "reheat" (afterburners), which consumed fuel at an incredible rate of 32.5 liters per second. Overall, Concorde used roughly half of its total fuel load just to reach its cruising altitude and Mach 2.02 speed. While its Olympus 593 engines were actually some of the most thermodynamically efficient powerplants ever made when at their optimal supersonic cruise, the high cost of "feeding" these engines, combined with rising 20th-century oil prices and a small 100-seat capacity, ultimately made the supersonic dream economically unsustainable for commercial airlines.