U used to run Byrons 20/20 thru all of my engines but I've switced to Magnum #1 for all my saitos as well as my 2 opperational Helis. I always add about 2 oz's of Klotz per gallon of fuel (3 -4 ozs if it's a real hot summer) All of my enignes love it..smooth low idles and loads of power.