BOAC is right. I bug the speed in the middle of the amber bands and let the speed do it's own thing within reason. The bugged speed works out around M0.77 at altitude and then the actual speed varies between 0.75-0.80 depending on the amount of and severity of the turbulence. Of course if it gets rough and the A/T starts chasing the speed too much, just disconnect the A/T and set the Turb N1
