We could (and no doubt will........) argue for days of the value of 'fuel league tables'. I flew with a Captain in DanAir who had a database of burns for each sector he flew and thought this was 'useful', but had no record of ZFW, wind or route flown.
FL tables are only as useful as the Al Gore rhythms used - in my time, BA's 'favoured' the managers (funny old thing) who flew more out and backs late am into a quietish base on return, and penalised the working class who got up at oh-***-awful in forrin parts and flew into a CatIII base on a regular basis. Pretty well meaningless.