Which fuel grade is commonly used in typical aircraft engines?

AVGAS 100 is a high-octane aviation gasoline specifically formulated for use in piston-engine aircraft. This fuel grade provides the necessary performance characteristics, such as anti-knock properties and stability, that are crucial for the operation of these engines. AVGAS 100 offers reliability and efficiency, making it a standard choice among aircraft operators. It is designed to meet stringent specifications required for aviation applications, providing pilots with confidence during flight operations.

The other fuel grades listed are not typically used in standard aircraft engines. D.T.D. 585/100 and D.E.R.D. 2479 are references to different types of fuels that might be used in less common or specialized aviation applications, while D.E.R.D. 2484 is not widely recognized as a standard fuel for aircraft engines. Therefore, AVGAS 100's prevalent use and suitability for piston-driven aircraft engines make it the correct choice in this context.