Which type of fuel is used in the Cessna 172?

The Cessna 172 primarily uses 100LL Avgas, which stands for 100 octane low lead aviation gasoline. This type of fuel is specifically designed for piston-engine aircraft and provides the necessary performance characteristics to support the engine's requirements. The "100" indicates the fuel's octane rating, which is essential for ensuring smooth and efficient operation of the engine, particularly under high-stress conditions like takeoff and climb.

Using 100LL Avgas helps mitigate the risk of detonation and engine knocking, which can occur if fuel with a lower octane rating is used. This fuel also contains lead, which helps lubricate the engine and protect valves, a feature critical in older aircraft engines.

The other options do not meet the specifications for the Cessna 172. Jet A is intended for turbine engines and is not compatible with the piston engines used in the 172. AVGAS 80 is generally used in lower-performance aircraft and does not provide the necessary octane level for higher-compression engines like that of the Cessna 172. Although 100 Octane is a correct measurement, it lacks the specification of "low lead," which distinguishes 100LL from other aviation fuels. Thus, 100LL Avgas