Boeing 747-400 fuel economy

Boeing 747
Maximum range at maximum takeoff weight (MTOW): 7,260 nmi (8,250 mi 13,450 km)
Maximum fuel capacity: 57,285 U.S. gal
Typical seating capacity: 416

57285 / 8250 / 416 * 6453 = 107.709821 gallon/person/trip

57285 / 8250 / 416 = 0.0166914336 gallon/mile/seat
(8250 * 416) / 57285 = 60 MPG/seat

Spirit Airlines A319 80% load 70 MPG / person

IATA fuel monitor / price analysis 42 gallons / barrel