What is the optimum fuel/air ratio for gasoline?

The optimum fuel/air ratio for gasoline, commonly referred to as the stoichiometric ratio, is 14.7 parts of air to 1 part of fuel. This ratio indicates the ideal mix of fuel and oxygen required for complete combustion. At this level, all the fuel can react completely with the oxygen, producing the maximum amount of power while minimizing emissions. Operating at this ratio ensures that the engine runs efficiently, completing the combustion process without leaving excess fuel or unburned hydrocarbons, which can lead to increased emissions and reduced performance.

This stoichiometric value is based on the specific chemical properties of gasoline and reflects the ideal conditions found in most gasoline engines. It is crucial for achieving optimal engine performance, fuel efficiency, and adherence to environmental emissions standards.