When I flew the DC-10 on the N-register the company I worked for used to publish "absolutely without prejudice" fuel burn tables on a monthly basis.
Now, unlike our BA colleagues, I was very interested in these tables for I wanted to learn how to operate my aircraft as efficiently as possible. I learned a lot of good techniques and was usually in the top three but I could never quite get up to Jack's standard! He was always at the top and it was almost impossible to get him to part with his deep secrets.
Provided that league tables are used in a non-threatening way then I think they are really good at getting yourself up to speed.
However, if all you want to do is p*ss fuel out the back the way you have always done and can't be bothered to get really efficient then do remember that we are now up to $74 a barrel and pensions have to be paid.