PAFI Tests Show More Work Needed on Avgas Replacement
The FAA is evaluating three other fuels as work continues on the original Shell candidate.

Finding a drop-in unleaded replacement fuel option for aviation gasoline is proving more difficult than originally hoped, as the candidate selected by the FAA needs more work. In a recent update on research into the unleaded replacement, the agency said test results of an optimized fuel candidate from Shell “were not successful” and indicate a need for additional refinements.


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