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There's three ways to reduce the fuel consumption in an airplane, starting with the easiest; reduce the total weight, reduce drag, and increase the engine's efficiency. In a more practical vein... The foregoing is a great answer in a theoretical sense. However, in a practical sense, there are any number of ways to reduce fuel consumption through the careful planning and execution of the flight. For instance, selecting the most appropriate altitude considering winds and engine performance, and selecting the best route considering winds and distance, both will make a huge difference in total fuel consumption. Flying the aircraft in the most efficient manner, at the proper speeds, and using the best climb and descent profiles will also save fuel. The airlines devote massive amounts of time and energy in discovering the most efficient flight profiles, as even a small savings in fuel can, over a year's time, and with a large fleet of aircraft, result in significant savings.

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Q: How do you reduce the fuel consumption of an airplane?
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