GAMI's G100UL® unleaded avgas STC available now!

We have completed the final steps of the certification process and are proud to announce the opening of our STC store to the general aviation community.

Aug 3, 2023

GAMI Should Be Allowed to Sink or Swim On Its Own

Early in the week at AirVenture, GAMA's Pete Bunce declared that the market would determine which of multiple unleaded avgas products would ultimately prevail. What he failed to mention is that GAMA, the other alphabets and the EAGLE industry consortium have been hell bent on keeping their thumb on the invisible hand's scale. And they're not reticent to use federal law to do it.

"The FAA approval of G100UL® high octane unleaded avgas is a truly huge development for the future of general aviation! GAMI and all of its employees have dedicated themselves to this project for over a decade. Now is the time for all of the stakeholders in the general aviation community to stand up and celebrate. These AML-STCs cover all spark ignition piston engines used in our aircraft. This approval of G100UL avgas is the beginning of the end for the continued use of lead in aviation gasoline."

What is GAMI's G100UL® unleaded avgas?

The result of over a decade of painstaking research and certification work, GAMI's G100UL unleaded avgas is a functional drop-in replacement for 100LL avgas that maintains or improves engine performance and, simultaneously, significantly reduces routine maintenance costs imposed by the use of leaded avgas.

  • Performance
  • FAA Certified
  • Lead Free
Will I have to modify my engine or aircraft to use G100UL avgas?

Other than placards, no modifications are required. A small placard is attached to the engine and "stick-on" placards are applied to refueling ports. In addition, there is a short POH supplement added to the AFMS.

How much is G100UL avgas going to cost?

Current best estimates are that the premium components that comprise G100UL avgas could cost 70¢ to $1.05 more per gallon than 100LL until it becomes more widely available. It is likely the higher fuel price will be offset by lower maintenance costs for the aircraft.

How soon can I buy a tank of G100UL avgas at my airport?

As fast as production can be ramped up and fuel can be delivered to airports. G100UL will initially appear at airports in California, Oregon and Washington in the second quarter of 2024.

Please see our detailed G100UL unleaded avgas FAQ for answers to more of your questions.

Complete FAA approval

This beautiful EAB Aircraft already has a complete FAA approval for the use of G100UL high octane unleaded aviation gasoline.

With required placards on the wing.

EAB Aircraft