Sounds about right. It does run "best" at close to 270 - which means I should be on the richer side of that at all times - which I religiously run at - I had just been confused from reading the manual. 220 just seemed so low. I went to my LHS and they had mentioned the same information you just provided - 230 - 250. That is the range I usually had been trying to run at. I will take the Nitro content advice and try some 15 or 20% to see if it will get me the extra low end power. Thanks for the advice. Helpful.