FAA selects two fuels for unleaded avgas testing [feedly]

FAA selects two fuels for unleaded avgas testing
http://www.flightglobal.com/news/articles/faa-selects-two-fuels-for-unleaded-avgas-testing-423621/

A nearly decade-long search by the US government to find a new avgas formula that can replace leaded fuel in hundreds of thousands of piston-powered aircraft has entered a final, two-year evaluation with two remaining contenders: global heavyweight Shell and US-based start-up Swift Fuels.