While GAMI's G100UL high octane unleaded avgas is FAA approved for every aircraft model in the FAA's database, there's still some mystery among many aircraft owners. Moreover, how does the new fuel run in a typical GA aircraft engine? In this video, Aviation Consumer magazine's Larry Anglisano Zoomed up with Jon Sisk who recently conducted an exhausting flight trial in his Lycoming-equipped Van's RV-14, White Lightning. Sisk made side-by-side engine data comparisons burning G100UL and 100LL and reported his findings, with some advice on how you can add this approved fuel to the aircraft's limitations.