Conklin de Decker 2009 says 18.5% more fuel. And your 35% number is impossible. The G550 only carries 29% more fuel than the 7X, and it should go over 10% farther at M.85. It is truly scary that people's lives are in your hands when you have no idea about the characteristics of the planes you fly and you have such an unprofessional attitude towards safety.