Truth be told I don't think the rotor losses on the flagship rotors are greater than the old 88 series. If so then the only reason is that more horsepower just pushes more grain over.I have heard the rotor loses are the main one, if they are the same rotor as the 88 , why such high loses? All dry land here, how bad on fuel are they? They would be great with less belts and rotor reverse. Have been told to speed knife up. And I am just a curious fellow.