G100UL arrives in Mississippi
December 20, 2024, G100UL high octane unleaded avgas arrives in Mississippi. Tupelo Regional Airport receives the first shipment.
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.
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
- 100% 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 more than 100LL 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. The first customers for the fuel are likely to be flight schools or high usage charter operators. G100UL avgas had started its rollout in CA and is presently available at a number of locations. Check our availability map for details.
Frequently asked questions
Please see our detailed G100UL unleaded avgas FAQ for answers to more of your questions.
Latest G100UL News
RE: Cirrus Service Advisory SA24-14
Contrary to the recently released Cirrus Service Advisory SA24-14 the use of G100UL Avgas is fully compatible with both PSD & PTE sealants when either of those sealants are properly applied during the production of the wings and fuel bays of Cirrus SR22 aircraft.
G100UL® Avgas STC Day
Saturday, November 2nd, was G100UL® Avgas STC Day at Reid-Hillview Airport
"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."
Tim Roehl
GAMI President