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countable and uncountable, plural avgases or avgasses
(aviation) Gasoline fuel for piston-engined aircraft. quotations examples
Cylinder cracks are nothing new, however, and there is no reason to expect autogas-burning engines to have a higher incidence of head cracking than avgas-users
1988, Kas Thomas, Fuel and oil systems: basic and advanced light plane maintenance
In the area of autogas volatility, a Reid vapor pressure of 9.0 to 15 is very common, compared to the vapor pressure of avgas, which is 5.5 to 7
1994, Michael J. Kroes with Thomas W. Wild, Aircraft powerplants
Autogas can be obtained for a fraction of the cost of avgas, but its use is not without controversy.
2006, Aircraft Owners and Pilots Association, The AOPA pilot: voice of general aviation, volume 49