Aviation gasoline, commonly known as avgas, is a specialized fuel designed for use in piston-engine aircraft. It is formulated to provide high performance and reliability at various altitudes and temperatures. Avgas is typically colored blue or green to distinguish it from automotive fuels and is available in different grades, such as 100LL (low lead) and 100. Unlike regular gasoline, avgas contains additives to enhance its stability and prevent engine knocking. It is crucial for pilots and aircraft operators to use the correct type of avgas to ensure optimal engine performance and safety during flight.