I think it's time now for fuel "league tables" to be banned by the authorities before something really nasty happens as these individuals strive to be at the top.
Take away their incentive to take less than a sensible amount of fuel and maybe they'll take a sensible amount.
Incidentally, some years ago the CAA issued a circular advising all aircraft inbound to LHR and LGW to take at least 20mins. extra on all occasions because of the unpredictable nature of delays. I wonder how often that is followed?