octane enhancing additive

例句：

1. 1.The fuel blend contains a special additive to enhance the octane rating of the gasoline.
   该燃料混合物包含一种特殊添加剂，以增强汽油的辛烷值。
2. 2. The manufacturer claims that their additive helps to improve engine performance.
   制造商声称他们的添加剂有助于提高发动机性能。
3. 3. The additive is designed to prevent the formation of gummy deposits in the fuel system.
   这种添加剂旨在防止燃油系统中形成粘稠沉积物。