Any replacement fuel will require support from both Lycoming and Continental. It is extremely unikely there will be multiple fuels for general aviation gasoline engines. Continental has placed one nail in the 100 octane coffin by announcing its support for 94UL, and diesel. Lycoming, on the other hand, has announced that nothing other than an unleaded 100 octane or greater will be satisfactory. Yet, the Lycoming General Manager has commented that he is unaware of user support for a clean 100 octane fuel.
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