Fuel additives are added to gasoline/fuels to enhance properties and provide additional properties not present originally. They are used as combustion modifiers, antioxidants, corrosion inhibitors, and deposit control detergents. Some common types of additives include acetone, ether, nitrous oxide, nitromethane, butyl rubber, ferox, oxyhydrogen, and ferrous picrate. Additives provide benefits such as stabilizing gasoline, preventing fuel line freezing, boosting octane, cleaning fuel injectors, lubricating engine parts, preventing fuel gelling, improving storage stability, and reducing corrosion and static build-up. They enhance safety and reduce costs associated with corrosion and wear.