Thanks for the tip Dave. I have tired heli fuel in my other two Saitos (bot FA-80's) and it does seem to help. However, Ihave a Turbo-Header on one and it gives me about 300 rpm more running 20% or 30% so, I've stayed with 20% for those two engines. Idon't have that muffler for the .91 so heli fuel may do the trick. I'll fy it on the 20% (because Ihave it on hand)and see how she performs. If she needs it, I'll pick up a Turbo-Header for it ANDrun 30%.

RJ