Avgas is a high-octane aviation fuel used for aircraft and racing cars. Avgas is a portmanteau for aviation gasoline, as distinguished from mogas (motor gasoline), which is the everyday gasoline used in cars. Avgas is used in aircraft that use piston or Wankel engines. Gas turbines can operate on avgas, but typically do not. Turbine and diesel engines are designed to use kerosene-based jet fuel. Avgas properties and varieties Gasoline used for aviation fuel generally has two numbers associated… (More on Avgas)