General Aviation Modifications Inc. (GAMI) has officially begun selling supplemental type certificates (STCs) for its G100UL 100-octane unleaded avgas. As previously reported by AVweb, the FAA approved STCs for the use of G100UL in all general aviation piston airplanes in September 2022. GAMI says it is looking to have the fuel available in California by mid-2023 and nationally by 2026.
“GAMI is excited to announce the opening of its online G100UL STC store,” the company said. “All gasoline powered airplanes and engines in the FAA’s type certificate database are covered by the STCs for G100UL, which is the first and only FAA-certified, totally lead free, high octane avgas.”
As with similar fuel STCs, price for the G100UL STC varies based on an aircraft’s engine and horsepower. According to GAMI, it comes out to roughly $2 per horsepower, bringing average STC cost for aircraft such as the Cessna 210, Cirrus SR22 and Piper PA-32 to the $600 range. When it comes to the fuel itself, the company says pricing for G100UL will be “slightly higher than 100LL” until production volume reaches several million gallons annually.
Further G100UL STC information is available at G100UL.com.