Efforts to remove lead from aviation gasoline date from the mid-1970s when the first unleaded and low-lead fuels were introduced by refiners in response to the Clean Air Act. The initiative to qualify some light aircraft piston engines for operation on automotive fuel (“mogas”) stemmed from that era, as well. Now, pressure is being applied to the refining industry and the FAA to eliminate low-lead fuel, principally 100LL. The problem is that no substitute avgas currently exists that can ...

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