If so, can someone please tell me why;
1. If a specific procedure(getting on the step) could increase the cruise-performance of an airliner significantly, why doesn't manufacurers tell us about it?
2. Why is there no sign of speed instability around cruise speed? There should be, if drag decreased with increasing speed.
I realize of course that if you fly a speed close to, or below mininmum drag speed, there would be "a step" (in holdings, for example).
BTW I fly F50's, basically a F27 with new engines. It does not have a step.