I like the FAI fuel approach as it is simple and should be available. I was wondering if any simple additive that you have tried that could be added to get back a little punch?
Available, maybe, simple, not so much, at least if you want consistent performance over a wide range of conditions. We are not doing it for "more power", power ceased to be an issue 30+ years ago, no matter what fuel you use.
I guess I do not see the issue with regular fuel, it is still generally available (particularly high nitro as used in RC Cars) and well below the inflation curve from the 50ish years I have been flying models. I used to pay $7 a gallon for store-brand fuel (Lew McFarland's store, so not just any random guy pouring stuff together) in, say, 1978, here it is 45 years later, I got very similar fuel at the hobby shop the other day for $30. That's 428% Gas at that time was 67 cents/gallon, it is now $5.25, that is 783%. Granted there is a lot of Biden in that, but still.
Brett