Well, as with everything the feds touch, they screwed up the fuel replacement path with avgas too. There is one provider of unleaded avgas now called SwiftFuel.
https://swiftfuels.com/faq/
They have a UL91, UL94, and UL102 octanes, but their sales are microscopic.
The drop in replacement for 100LL(leaded avgas) is the UL102. It's been in development and testing now for about 9 YEARS. Always the feds drag their feet on certification. First, they wanted to certify it by airframe, like auto fuel. That hasn't worked well. Next they wanted to develop completely new standards for fuels, and that died on the vine. now, they say it's nearing the end of investigation and will soon be certified for all aircraft using 100LL. We'll see, what we see. I don't hold much hope.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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