Clean, high-quality fuel ensures the engine performs optimally, delivering the correct power output and throttle response. The correct fuel properties, such as specific viscosity and octane ratings (for Avgas), prevent issues like engine knocking or detonation (in piston engines) and guarantee consistent performance across varying flight conditions.

High-quality fuels, particularly sustainable aviation fuels (SAF), have fewer impurities (like sulfur) and burn cleaner, resulting in lower emissions of harmful pollutants and a smaller carbon footprint.