Octane rating
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An octane rating, or octane number, is a standard measure of a fuel's ability to withstand compression in an internal combustion engine without causing engine knocking. The higher the octane number, t
A US gasoline pump offering five different octane ratings
Gas stations have gasoline with different octane ratings. Higher numbers indicate that the fuel can better avoid unintended combustions within the cylinders of the engine.
A 1940s US propaganda poster using the term "octane" to emphasise power
Avgas
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Avgas is an aviation fuel used in aircraft with spark-ignited internal combustion engines. Avgas is distinguished from conventional gasoline used in motor vehicles, which is termed mogas in an aviatio
Octane rating
…for gasoline engines. Using gasoline with lower octane than an engine is built for may cause engine knocking and/or pre-ignition. The octane rating of aviation gasoline was extremely important in determining aero engine performance in the aircraft of World War II. The octane rating affected not only the performance of…
An American Aviation AA-1 Yankee being refueled with 100LL avgas
Taking a fuel sample from an under-wing drain using a GATS Jar fuel sampler. The blue dye indicates that this fuel is 100LL.
An EAA Cessna 150 used for American certification of auto fuel
Purdue University Cessna 150M Swift Fuel demonstrator