Who give a F@$% about fuel burn?
This hunk of junk is a pain in the ass to fly. It's annoyingly noisy, the VNAV descent doesn't work properly, the FMCs are ridiculously slow, it takes tricks to get the CPDLC to log-on, the radar in auto tells lies and the galley is an unmitigated disaster.
OK, its got grunt, its miserly on fuel, the brakes are amazing and the flight controls are a dream, but what has Boeing EVER done for us?