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How many gallons of gas does it take to fill a helicopter?

Helicopters do not run on gasoline, they use aviation fuel which is measured in litres or pounds not gallons. The amount of fuel a helicopter consumes can vary greatly depending on the size of the helicopter, its engine type, and its flight conditions. Generally speaking, smaller helicopters like the Robinson R22 or R44 have fuel tanks that can hold around 50 gallons of jet fuel, while larger helicopters like the Sikorsky S-76 or S-92 have tanks that can hold up to several hundred gallons of fuel.