What I do not understand - why hasn’t Todd Petersen been invited to weigh in on this topic? For over 30 years he has done the bulk of aviation fuel tests on airframe / engine combinations required for his 100+ STCs, covering everything from Cubs to DC-3s. In one sense, he has been providing a safe, powerful, FAA-approved, highly available and affordable lead-free aviation fuel - Mogas - for the vast majority of piston aircraft. Perhaps AVWeb can interview the “Dean of Mogas” to get his take on things. I’m sure he has some thoughts on all of this.