Was comparing B744 to A340 because they are the a/c types that the airline I work for operate, and also when A340 was first launced that was what it was competing against, as the 777 didn't exist at the time, and I never said it was an inefficient gas guzzler, just stating that it uses more fuel per pax than an A340 does, as isn't the A340 the most fuel efficient a/c per pax mile than any other ?.
Can't be bothered to get facts and figures, i'm sure you could find them on the net if you are that interested.
These discussions always end up slating (even in jest) the A340 'cos of the fact (that we all know), that the A340 climbs and cruises slower than a B744/777, and no-one ever seems to have anything positive to say about it.
Anyway, who really cares, all the a/c do what the designers intended, and if it get's me from A-B in 1 piece, then I couldn't care less what I fly on. I wouldn't take or not take a particular flight/airline just because of the a/c type they were using.
"She Rolls, 45 knots, 90, 135, nose comes up to 20 degrees, she's airborne - She flies, Concorde Flies"