Gasoline additives are special liquids that people add to their car's gasoline to help it run better. People add these liquids because they help protect the car's engine and keep it running smoothly. They also help reduce air pollution, which is good for the environment. When you add the additive to your car's gas tank, it mixes with the gasoline and prevents it from becoming too thick so it can flow easily. This helps make your car run more efficiently and keep it running longer!