Another characteristic of the Allison 250 is that it has a fairly high lapse rate, meaning that its power output drops quickly with altitude above sea level and air temperature above standard. The engine will produce its maximum rated cruise power to about 16,000 feet, lower if air temperature is above standard, or higher on a colder day aloft. That means the Extra 500 won't be joining the other turboprop singles at FL 290, but will instead have a certified ceiling of 25,000 feet. Typical cruise altitudes, unless you're going downwind, will be in the mid teens. With a tailwind, a climb to FL 250, where true airspeeds are lower along with low fuel flows, would be very nice. Headed upwind, you can afford to fly the Allison at much lower altitude than the PT-6 without suffering the same fuel penalty and loss of range.