"FAA approved STCs for the use of G100UL in all general aviation piston airplanes in September 2022"
https://www.avweb.com/ownership/fuel-news/gami-begins-g100ul-stc-sales/
"FAA approved STCs for the use of G100UL in all general aviation piston airplanes in September 2022"
https://www.avweb.com/ownership/fuel-news/gami-begins-g100ul-stc-sales/