Avgas (aviation gasoline, also known as aviation spirit in the UK) is an aviation fuel used to power piston-engine aircraft. Avgas is distinguished from mogas (motor gasoline), which is the everyday gasoline used in cars and some non-commercial light aircraft. Unlike mogas, avgas contains tetraethyl lead (TEL), a toxic substance used to enhance combustion stability.
Avgas is used in aircraft that have piston or Wankel engines. Gas turbines are able to operate on avgas, as the pioneering German Jumo 004 turbojet of World War II was able to do, but typically do not, partially for reasons of fuel economy. Turbine and diesel engines are designed to use kerosene-based jet fuel.[citation needed]
The main petroleum component used in blending avgas is alkylate, which is essentially a mixture of various isooctanes, and some refineries also use some reformate. All grades of avgas that meet CAN 2-3, 25-M82 have a density of 6.01 lb/U.S. gal at 15 °C, or 0.721 kg/l, and this density is commonly used for weight and balance computation. Density increases to 6.41 lb/US gallon at -40 °C, and decreases by about 0.5% per 5 °C (9 °F) increase in temperature. Avgas has an emission coefficient (or factor) of 18.355 pounds CO2 per U.S. gallon (2.1994 kg/l) or about 3.05 units of weight CO2 produced per unit weight of fuel used. Avgas has a lower and more uniform vapor pressure than automotive gasoline so it remains in the liquid state despite the reduced atmospheric pressure at high altitude, thus preventing vapor lock.
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