Any truth to the rumour that the yet to fly 747 800 is expected to burn at cruise something in the order of 7 tonnes and hour as opposed to the A380 that burns 13 ?
No there is no truth to this rumour. The Boeing website states that the 747-8 will have 2% lower fuel burn than the 747-400. So the comparison is more like 9.8 Vs 13 tonnes per hour on average. One must also remember the 380 holds 19% more passengers.