New Standard Specification Clears Hurdle For UL100E Fuel
A proposed 100-octane unleaded aviation fuel, UL100E, has moved closer to potential fleetwide approval, as the US general aviation industry faces pressure to transition away from leaded 100LL avgas. The fuel, developed by LyondellBasell and VP Racing Fuels, is the only unleaded 100-octane fuel participating in the FAA’s Piston Aviation Fuels Initiative (PAFI) approval path. With testing still underway, the companies said fleetwide FAA approval could follow later in 2026. The initiative was launched in 2014 to address mounting environmental and regulatory pressure to eliminate lead emissions from aviation gasoline. This development was first reported by AeroTime.