So I'm looking at my OKA-IAH route, where I have a340-200 and 777-200er flying.
A340-200 has 4 engines, each with a fuel flow of 39,936, and the per-flight fuel cost is $283,404
777-200er has 2 engines, each with a fuel flow of 45,203, and the per-flight fuel cost is $325,084
How in the world is the a340 cheaper? By my estimation it should use almost twice as much fuel, especially considering it travels slower than the 777.