Swift Fuels is the only company selling unleaded avgas in the United States and has expanded its distribution network across the country.
I’d had the tanks filled the previous evening with “94UL”—an unleaded product from Swift Fuels that is chemically identical to 100LL without tetraethyl lead. The new Swift fuel is FAA-approved for engines that can operate on 80/87-octane aviation fuel, or the 91-octane fuel that the 160-horsepower Lycoming IO-320 in my Experimental-category RV-3B requires.
Swift Fuels is once again creating a buzz in the general aviation world with the announcement that it will produce 94 MON avgas. The unleaded fuel alternative will work in light sport aircraft that have Rotax engines, aircraft that have a supplemental type certificate for autogas, and airplanes that can run on avgas (engine rated 94 motor-octane-number or lower).