Avgas, short for aviation gasoline, is a specialized fuel used primarily in piston-engine aircraft. It is designed to provide the necessary performance and reliability for aviation applications, with a higher octane rating than regular automotive gasoline. The most common types of Avgas are 100LL, which is low-lead, and 100, which contains higher levels of lead. Avgas is crucial for the safe operation of many general aviation aircraft, including small planes and some military aircraft. Unlike jet fuel, which is used in turbine engines, Avgas is specifically formulated to meet the unique demands of piston engines, ensuring optimal performance and efficiency during flight.