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GAMI Answers G100UL Criticisms, Point By Point

GAMI founder George Braly offers responses to a series of criticisms and questions about G100UL, his company’s unleaded replacement for 100LL.

Aircraft being fueled
Aircraft being fueled [Credit: Shutterstock]
Gemini Sparkle

Key Takeaways:

  • GAMI asserts its G100UL Avgas is a fully FAA-approved "drop-in" replacement for 100LL, suitable for all spark-ignition engines, including forthcoming approval for rotary-wing aircraft.
  • The article refutes criticisms regarding G100UL's industry acceptance, stating that major engine manufacturers, distributors, and insurers have found no technical objections or issues with its use.
  • GAMI dismisses other unleaded fuel initiatives as costly failures and warns against multi-fuel solutions or engine modifications as detrimental to general aviation.
  • GAMI emphasizes its transparency, with G100UL specifications publicly available, and highlights potential benefits such as extended maintenance intervals due to lead removal.
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Editor’s Note: This article first appeared on AVweb.


Last week’s blog was more of an update on progress so far on the replacement of 100LL with unleaded high-octane aviation fuels. In the comments section, a reader who uses the title BestGlideSpeed gave a long list of questions and criticisms of General Aviation Modifications Inc.’s (GAMI’s) G100UL.

Russ Niles

Russ Niles is Editor-in-Chief of AVweb. He has been a pilot for 30 years and joined AVweb 22 years ago. He and his wife Marni live in southern British Columbia where they also operate a small winery.

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