The Gulfstream is capable of cruising at Mach 0.85 at over 51,000 ft over land and has a maximum non stop range of 7,000 Nautical Miles. Also the maximum specified speed for the G650 is Mach 0.925, which is almost the sounds speed and if any other sub sonic private jet that can come near those figures is the Cessna Citation X with a max speed of Mach 0.92 i.e. 0.005 slower than the Gulfstream. A service ceiling of 51,000 ft assures the Gulfstream G650 flies well over the crowded space. The G650 uses Rolls Royce BR725 series engines for a silent more economic and well as powerful experience.