With the flap selector moved to the new, high power detent, the PT6 was able to deliver full-rated power and, despite a brief level-off down low, the new 850 reached 28,000 feet in less than 18 minutes. At that level with maximum cruise power set, the true airspeed varied between 306 and 310 knots, though air temperature was almost 20° C above standard and we were at maximum weight. Fuel flow, which is displayed in gallons per hour, unusual for a turbine, was 58.5 gph. If temperature had been standard, the handbook shows a cruise speed of around 320 knots, or a little more as fuel burned off. Under standard conditions at mid-cruise weight, the 850 delivers 320-knot true airspeed at 26,000 feet, but slows only to 315 knots at the ceiling of 31,000 feet, so there is very little penalty to climb. Fuel flow, however, drops from 66.6 gph to 55.8 gph for those five knots of airspeed.