Proper volatility, which determines how easily the gasoline vaporized
•Resistance of spark knock or detonation
•Oxidation inhibitors, which prevent formation of gum in the fuel system.
•Antirust agents, which prevent rusting of metal parts in the fuel system.
•Anti-icers, which retard icing in the throttle body and fuel-line freezing.
•Detergents, which help keep the carburetor or fuel injectors clean.
•Dye for identification, such as red dye which gives leaded gasoline.