What is the purpose of fuel additives?

Fuel additives play an essential role in enhancing the properties of aviation fuel, thereby improving overall performance and efficiency. These additives can address various concerns, such as stability, flow, and combustion characteristics. For instance, certain additives function as anti-knock agents, improving combustion efficiency. Others may prevent the formation of deposits that could clog fuel filters or injectors, ensuring a more reliable fuel system operation.

While additives can indeed influence the shelf life of the fuel and its appearance, their primary function is to improve properties that contribute to the effective and safe operation of the aircraft. Enhancements in characteristics like temperature stability, thermal properties, and reducing the tendency of fuels to form harmful deposits directly translate to better engine performance and fuel efficiency.