had a chance to fly a couple of longer flights today, used the technique of setting the alt 1000 above cruise, and setting 500 feet above landing altitude on descent. It worked well, except that for flights above 24,000 feet, when setting, say, 25,000 on the press control, we got a cabin alt over 10,000 with an associated altitude warning light. Cabin holds 4.6 diff with no problem.
Another thing I have noticed is that we rarely get an auto feather arming on takeoff due to the low N1 (below 90 percent), even using 1300 tqe. In the summer the rpm easily exceeds 90, but in the winter it reaches only 88 percent, which means the auto feather will not be available in the event of an engine failure.
Interesting airplane. Nice to fly though. Got a sim check next month, hope I have learned enough by then..