Adam Hunt September 1, 2022 9:12pm GAMI Unleaded Avgas Approved For GA Piston Fleet This is actually pretty big news and will hopefully signal the beginning of the end for this last significant source of environmental lead - aviation gasoline. #aircraft #aviation #pollution #lead #avgas GAMI Unleaded Avgas Approved For GA Piston Fleet - AVweb In a first for the aviation industry, the FAA has approved STCs for the use of GAMI’s G100UL 100-octane unleaded avgas in all general aviation piston aircraft.