What is the difference between oxygenated fuel and non oxygenated fuel?

Oxygenated fuel contains oxygen in its molecular structure, typically in the form of ethanol or methanol, which helps improve combustion efficiency and reduce emissions. Non-oxygenated fuel, on the other hand, does not contain oxygen additives and relies solely on the fuel's hydrocarbon content for combustion. The presence of oxygen in oxygenated fuel can lead to a slightly leaner air-fuel mixture, which may require adjustments to the engine's fuel delivery system for optimal performance.