Gasoline also known as petrol is an energy-dense secondary fuel that can be thought of as an energy currency. It is used to power many heat engines, most importantly it acts as a fuel for a large proportion of cars. Gasoline is made when crude oil is broken into various petroleum products through a process of fractional distillation. The finished product is then distributed to gas stations through pipelines.

Automotive gasoline and gasoline-oxygenate blends are used in internal combustion spark-ignition engines. These spark ignition engine fuels are primarily used for passenger cars. They are also used in off-highway utility vans, farm machinery and in other spark ignition engines employed in a variety of service applications.