I read a very interesting article today,not sure what paper as I read quite a few!
It would appear that Boeing,whilst claiming a 20% lower fuel burn per passenger for the 7E7,are not comparing the aircraft on a like for like basis with the A332,mainly due to the higher passenger load(on the 332) vs the entry model 7E7.The article goes on to say, if you matched the seating like for like, then the fuel burn improvement(over the 332) drops to between a 2 & 5%,not the 20% Boeing are claiming.
Now i'm taking the whole thing with a pinch of salt,hell,the thing has yet to fly and GE
have yet to produce the engines which are supposed to save the claimed 20%.
Sound like the whole A380 being massively overweight,something we have yet to see in concrete,yes we have rumors but we always have rumors slagging off Airbus planes as being overweight or inferior etc etc.