Kerwin, im running 15% Omega. I can get it through the club for a pretty good deal, and its also what most of the hobby shops sell. I have not seen any 20% in any of the hobby shops. Its either 15 or 30 heli. I was hoping it would do well on 15. I didnt want to pay $28 a gallon for 30% like I did when I was racing offroad with my girlfriends son. That gets pretty expensive.