Rival performance claims by Airbus and Boeing appear to be contradictory, their methodologies unclear and neither are validated by a third party source. Boeing claims the 747-8I to be over 10% lighter per seat and have 11% less fuel consumption per passenger, with a trip-cost reduction of 21% and a seat-mile cost reduction of more than 6%, compared to the A380. The 747-8F's empty weight is expected to be 80 tonnes (88 tons) lighter and 24% lower fuel burnt per ton with 21% lower trip costs and 23% lower ton-mile costs than the A380F. On the other hand, Airbus claims the A380 to have 8% less fuel consumption per passenger than the 747-8I and in 2007 Singapore Airlines CEO Chew Choong Seng stated the A380 was performing better than both the airline and Airbus had anticipated, burning 20% less fuel per passenger than the airline's 747-400 fleet. Emirates' Tim Clark also claims that the A380 is more fuel economic at Mach 0.86 than at 0.83. An independent analysis shows a fuel consumption per seat of 3.27 L/100 km for the A380 and 3.35 L/100 km for the B747-8I; a hypothetical re-engined A380neo would have achieved 2.82 to 2.65 L/100 km per seat depending on the options taken.