Autogas is a special kind of gasoline that is used to power cars. It is usually made from a mixture of propane and butane gases, which are liquefied under pressure. When these gases are burned in an engine, they release energy like regular gasoline. Autogas is less expensive than regular gasoline, and it's also cleaner, so it's better for the environment. When you fill up with autogas, you're helping to reduce air pollution!