Range Of Gulfstream's G500; G600 Extended Based on real-world operations the range of the two-newest in-service offerings from Gulfstream, the G500 and G600, have had their range extended. The newly increased range Gulfstream has added for the G500 and G600 now apply to both the high-speed cruise of Mach 0.90 and the long-range cruise speed of Mach 0.85. They new numbers for the new jets involved a marked improvement. Gulfstream says the G500 now delivers 5,300 nautical miles/9,816 kilometers at Mach 0.85 and 4,500 nm/8,334 km at Mach 0.90. The G600’s range at Mach 0.85 has been increased to 6,600 nm/12,223 km and 5,600 nm/10,371 km at Mach 0.90.