“There is nothing new under the sun.” Ecclesiastes. Paul Poberezny told me years ago how the FAA made the EAA’s Mogas STC testing very tough. Some claimed the agency was tougher on the FAA and Peterson Aviation than on Avgas suppliers. The consequence has been a 40-year track record of a safe and low-cost alternative to leaded avgas. It and other boutique fuels will probably be around for those who can afford them, but the vast majority of pilots in the future are going to be using Mogas and Jet-A Diesel as the price of other fuels climb. Those who self-fuel from the over 16,000 sellers of Mogas listed at pure-gas.org can probably also get a refund of the highway taxes on that fuel to lower costs further. All the details on Mogas are at https://www.autofuelstc.com/