the world transitioned to the leaded high octane ‘100’ grades which dominate the market today. According to the FAA, Avgas 100LL is the most commonly used grade with 190,000 registered piston-engine ...

Two unleaded 100-octane fuels have FAA authorization ... percent of the annual volume of avgas sold across the country. While there are companies like Swift and GAMI nearing the commercial ...

It’s important to be aware that UL91 can only be used in certain aircraft. The grade offers all the aviation industry benefits of Avgas 100LL but contains no lead additive or blue dye and is of lower ...