From:Andy Ruina <ruina@cornell.edu>Date:05 Oct 93 01:10:18 PDTOrganization:Cornell UniversityFollowups:1 2 3 4

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How efficient are planes? The number I would like to know is the total passenger miles of the airline industry divided by the total number of gallons of fuel used. That is, how many passenger miles per gallon to planes actually get on average. But other breakdowns would be interesting, say by length of flight. How good are the best planes running optimal distances with full passenger load? etc. Also, how small a fraction of the average fuel cost per passenger is the incremental fuel cost of adding a passenger? I was told by a reasonably credible person that planes get about 15 passenger miles per gallon (worldwide average) but that Lufthansa gets about 25 passenger miles per gallon. I find this interesting because it meanse that flying, on average, is as fuel intensive as driving a fuel-hog car alone. But is this true? Thanks for any info. -Andy Ruina, TAM, Cornell, Ithaca, NY 14850 607-255-7108