Why would you want to mess with nitro fuel ? Get one of those new 10 or 15cc gas engines. Then your fuel will cost 5 bucks a gallon instead of 20. Also, spark plugs don't burn out like glow plugs, and you won't need a glow starter. I flew nitro for years, YUK !
Granted, 4 strokes put alot less oil on your plane to wipe off, but gas doesn't leave any residue to speak of, sweeeeeeet ! I don't miss my small fleet of Saito's at all. Dennis