page_title: Avgas
section_title: 100LL (blue)
hierarchical_section_title: Avgas / Grades / 100LL (blue)
caption_attribution_description: English: Taking a fuel sample from an American Aviation AA-1 Yankee under-wing drain using a GATS Jar fuel sampler
context_page_description: 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 aviation context. Unlike motor gasoline, which has been formulated since the 1970s to allow the use of platinum-content catalytic converters for pollution reduction, the most commonly used grades of avgas still contain tetraethyllead, a toxic substance used to prevent engine knocking. There are ongoing experiments aimed at eventually reducing or eliminating the use of TEL in aviation gasoline.
  Kerosene-based jet fuel is formulated to suit the requirements of turbine engines which have no octane requirement and operate over a much wider flight envelope than piston engines. Kerosene is also used by most diesel piston engines developed for aviation use, such as those by SMA Engines, Austro Engine, and Thielert.
context_section_description: 100LL (pronounced "one hundred low lead") may contain a maximum of one-half the TEL allowed in 100/130 (green) avgas and pre-1975 premium leaded automotive gasoline.
  Some of the lower-powered (100–150 horsepower or 75–112 kilowatts) aviation engines that were developed in the late 1990s are designed to run on unleaded fuel and on 100LL, an example being the Rotax 912.
caption: Taking a fuel sample from an under-wing drain using a GATS Jar fuel sampler. The blue dye indicates that this fuel is 100LL.
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