What is the required fuel type for the aircraft?

The required fuel type for many light general aviation aircraft is 100LL, which stands for 100 octane low lead avgas. This fuel type is specifically formulated for use in piston-engine aircraft, providing the necessary octane rating to prevent engine knock and maintain performance under the conditions typical for general aviation flying.

100LL is commonly used because it is widely available at airports and is designed to meet the specific needs of aircraft engines that run on gasoline. It includes certain additives to reduce lead contamination, which is beneficial for both engine longevity and the environment.

In contrast, Avgas 80, while an alternative, does not provide the same level of performance or protection against pre-ignition in higher compression engines typically found in larger or more powerful aircraft. Jet A is a kerosene-based fuel meant for turbine engines, thus unsuitable for piston engines that require avgas. Lastly, while 100 octane is a measurement of octane rating, it does not specify the formulation or lead content that is critical for piston engines. Therefore, the designation of 100LL specifically aligns with the fuel requirements for trained pilots operating piston-engine aircraft.