New Boeing 7E7 is more fuel efficient than the A380

OK, here's my question. Aircraft manufacturers will do just about anything
to get 1% fuel savings. Boeing says the 787 will be 20% more efficient -
HOW? And why is everyone OK with it? I'm just curious, I'm not doubting
their claims, but sometimes if things sound too good to be true...

http://www.boeing.com/commercial/7e7/background.html

Thanks,

Hilton