20-30% nitro is whats recommended. And if you call and talk to the mechanic that works for team associated he will tell you never to run blue thunder fuel. He told me that he has torn apart many nitro engines and he can tell just by how the insides look if they been running blue thunder or not. I run blue thunuder in my rc10gt2 with os18cvr engine and it runs great! Awsome accelration and running 180-195 degrees. I could lean it a little more but its already running great. As for my mgt 8.0 i run nitrotane 30% by vp fuels. I will never go back to 20% in my 8.0 after running 30%. It seems to run cooler,more power,alot better tunablility