i was running 9.8:1 cp pistons and the head was milled twice so i would say the compression ratio was over 10:1 and i was running 17psi on 93 octane without detonation issues. i think if you were to use 11:1, just run a simple low boost setup on 93 octane and when you wanted to go to the strip get some 116 octane and turn the boost up.