We use to have a pilot at FedEx who was renowned for his fuel saving efforts. He did stuff like: changing the cost index in the FMS; flying higher than optimum; starting down later than the computer predicted; and his first configuration move was always "Landing Gear Down"; and other annoying and dumb things, not the least of which was not using the APU to cool the cockpit (as well as the E&E compartment), in the middle of the summer, in Memphis, until right before engine start. He was also renowned for his wife-swapping parties and vast library of porn, but that of course, is a different story. Anyway, he was very senior and flew a most non-standard jet. Needless to say, he drove everyone he flew with nuts. His sole stated purpose was to save gas. Conversely, he was such a d!ck-head, that we had a bunch of guys who would say their sole purpose was to use all the gas that Bill McK...y saved. And, oh by the way, he never did manage to save even a gallon of fuel, because he flew such an inefficient airplane.