But is fuel your biggest expense? You will probably find that anything you can save in fuel costs will be lost on en-route charges, engineering, crewing and utilisation overheads. Fuel is a significant proportion of your overall costs but I bet that if you (tree huggers, please look away) flew flat out everywhere, to hell with the fuel, you'd propably save your company money. However, unless you are given the numbers, we will never know!
PM