AVGAS

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avgas

[′av‚gas]
(materials)

AVGAS

Aviation gasoline—a fuel used for piston engines. The fuel grade is indicated by two numbers. The first number gives the knock rating for weak-mixture conditions, and the second figure is for rich-mixture conditions. Presently, only two grades of fuel are generally available—100/130 and 115/145.
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However, work by Swift Fuels, GAMI and others has demonstrated that tweaking the av-gas specification to allow the slightly heavier distillation and specific gravity required to include C8 and C9 aromatics has no discernible adverse effect on engines or performance.