Piston engine aircraft typically use aviation gasoline (avgas) or jet fuel. Avgas is a high-octane fuel that is specifically formulated for use in piston engines. It is made from a blend of hydrocarbons, including isooctane, heptane, and benzene. Avgas is volatile and has a high vapor pressure, which makes it easy to start engines in cold weather. However, it is also flammable and can be dangerous if not handled properly.
Jet fuel is a type of kerosene-based fuel that is used in jet engines. It is more stable and less volatile than avgas, making it safer to handle. However, it also has a lower octane rating, so it cannot be used in piston engines.
The type of fuel that an aircraft uses is determined by the type of engine that it has. Piston engine aircraft use avgas, while jet engine aircraft use jet fuel.