The recommended fuel is used for a reason.
Simply it's the Best for the engine.
Emergency use of 'Anything' that is liquid and will burn was only for when Ivan was coming over the horizon and now't else was available.
As was mentioned the Wasp could be run on 'Anything' but life of the primative donkey was shortened drastically, down to about 10 Hrs if Avgas was used.
john
