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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 founder George Braly asserts that G100UL is a fully approved "drop-in" unleaded avgas, having met or exceeded all original design criteria and received FAA approval for every spark ignition engine, with rotorcraft integration nearly complete.
  • Braly attributes significant delays and criticisms of G100UL's adoption to FAA impediments, including the costly and "failed" PAFI/EAGLE program, and opposition from "self-interested" industry entities.
  • He refutes claims that G100UL lacks industry acceptance, highlighting positive testing feedback from engine manufacturers like Lycoming and Continental, support from airframers like Cirrus, and confirmation of product liability insurance for distributors.
  • The article emphasizes that transitioning to unleaded fuel offers benefits such as reduced engine maintenance and extended TBOs, while cautioning that further delays are not feasible due to mounting pressures from various U.S. states.
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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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