G550 rules OK
I love it when I am asked what the max fuel is for the 550, and reply.....it does not matter...... if you need to ask you dont want to know.
For the 450 in general I would use 4200 mn. and feel more comfortable.
Now the 650 is a different matter........ I can not wait to play with one of those big boys toys... we have an early delivery position, and still hope the main man does not slip backwards...
glf