What type of fuel is used in the Cessna 172?

The Cessna 172 uses 100LL (low lead) aviation gasoline as its fuel. This type of fuel is specifically designed for aviation piston engines and contains additives that help prevent engine knocking while also providing the necessary performance sought in aircraft operations. The "100" in 100LL refers to the fuel’s octane rating, which is suitable for the engine design of the Cessna 172.

Low lead refers to its reduced lead content compared to the earlier formulations of aviation fuels, making it more environmentally friendly while still maintaining the performance characteristics needed for safe and efficient flight. The other fuel types listed, such as Jet A and 100 octane gasoline, are not compatible with the Cessna 172’s engine, which is optimized for 100LL. Jet A is a type of turbine fuel designed for jet engines, while 100 octane gasoline is a standard automotive fuel and does not meet the specific requirements for aviation use.