“The problem is that most of the GA flight can't move to Mogas or the UL91/96 because the engines won't run on it”
This is certainly not the position as far as Total is concerned. Totals target when it launched Avgas 91UL was to have 80% of the GA fleet approved over a 2 year period. My understanding is that batches of fuel have been delivered for certification testing is on-going. As 80% is most of GA the trick will be to avoid being left in the minority 20% when the music stops. Total have around another 18 months to get to its self-imposed target and according to Lyk there will still be another 5 or 6 years left in 100LL by then even if prices are likely to keep going up.
One comment on Permit flying – the popular Vans range uses mostly the same 160 – 250 hp Lyk’s that are common in GA, so the LAA is taking a very active interest in fuel, its testing and approval. It is important to have an alternative to 100LL for the good of GA and at least Total have launched a new fuel that will help.
Rod1