What is the capacity of each fuel tank in a standard Cessna 172's fuel system?

In a standard Cessna 172, each fuel tank typically has a capacity of 21.5 gallons. This design allows for an adequate fuel supply to support the aircraft's range and operational needs, while also maintaining a balanced weight distribution across the wings.

The total fuel capacity for the aircraft, which features two tanks—one in each wing—is generally 43 gallons. However, when considering usable fuel, the total effective amount is approximately 40 gallons due to fuel that remains in the tanks but is not usable because of the design and safety considerations. This ensures pilots have sufficient reserve fuel and manage flight operations safely.

The other options represent capacities that are not standard for the Cessna 172, thus emphasizing the accuracy of the 21.5-gallon specification. This specific knowledge is crucial for pilots when planning flights, as understanding fuel capacity impacts fuel management, weight calculations, and overall flight safety.