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Fuel Follies

Gemini Sparkle

Key Takeaways:

  • California is aggressively moving towards adopting GAMI's G100UL unleaded avgas, with availability expected by mid-year and legislative proposals to phase out 100LL starting in 2026.
  • Conversely, Swift Fuels' 94UL unleaded avgas has experienced issues, with the University of North Dakota reporting valve seat recession in engines after extended use.
  • The FAA/industry EAGLE initiative for a universal 100LL replacement by 2030 suffered a setback as a candidate fuel from Phillips/Afton failed a key test, leaving Swift Fuels as the primary remaining contender in that program.
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There have been some developments in the industry’s quest to shift itself away from leaded fuel, i.e., 100LL avgas.

We start in California, where the political push to get the lead out is strongest and has already resulted in prohibiting 100LL at a few airports. In early February, George Braly of General Aviation Modifications, Inc. (GAMI) told online sister publication AVweb.com that his company has an agreement that should result in GAMI’s G100UL unleaded avgas being available on the West Coast by mid-year. The fuel is STC-approved for all FAA-certified spark-ignition engines.

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