Zeke,
You are obviously loyal to the bus, fine. Been there, didn't like it. However it is not an "old wive's tale" as I have seen the comparisons on paper, and yes it was a CX ER, not a Boeing "spec" aircraft. So, yes the cost of fuel isn't everything, but the savings add up at around 15T less fuel per ULH sector, every day times 50 aircraft, or more eventually!