Gulfstream GIII Performance Gulfstream GIII Performance Description | Performance | Cabin ® Takeoff at Sea Level, feet 5,100 Takeoff at 5000′ 25°C, feet 7,175 Landing Distance, feet 2,600 Certified Ceilings, feet 45,000 Fuel Consumption, gallons per hour 568 Total Variable Cost $4,197 High Speed Cruise, knots 488 Ranges, Four Pax, Nautical Miles (NM) 3,565 600 NM Mission, Fight Time 1+26 1000 NM Mission, Flight Time 2+21 Performance Ranges (Full Seats/Full Fuel) Airport Performance/Takeoff Distance.