Resumen del autor, extraído del trabajo. Tighter controls are being placed on fuel composition to assist in reducing vehicle emissions. Gasoline sulfur levels, distillation properties, and oxygenate, aromatic and olefin content are the targets of ever more stringent specifications. With tighter control on fuel properties, the refiner's methods to produce gasoline are restrained. The antiknock additive methylcyclopentadienyl manganese tricarbonyl(MMT), provides the refiner with additional flexibility to meet gasoline specifications. In addition, the use of MMT can lead to reductions in vehicle emissions of NOx, and its N2O component, a potent greenhouse gas.