Fuel is a substance that provides energy to power engines and make vehicles move. In cars, fuel is burned inside the engine to create the power needed to drive. The less fuel your car uses to go a certain distance, the more fuel-efficient it is — saving you money and helping the environment. Different fuels work with different engine types.
A person fueling a car. © Wikimedia.org/Santeri Viinamäki, CC BY-SA