Engine manufacturers and airframers have long worried that the FAA would like the authority to declare the replacement fuel for 100LL as applicable for fleetwide use. But at Aero in Friedrichshafen, Germany, this week, Lycoming’s Michael Kraft told Avweb that the FAA reauthorization bill currently snaking through congress has specific language giving the FAA administrator power to declare a fuel suitable for the entire GA fleet.
Source: avwebAero: FAA Reauthorization Has Good News For 100LL Replacement