The PLOG leaves you with the exact fuel required by law at your destination
Do you fellas up there in Europe not have to carry 5% contingency fuel to cover unplanned additional fuel burn? This is part of min legal gas down here. UK to Istanbul, roughly 3.5 hours, roughly 9000kg fuel burn in 737, so should be 450kg of contingency fuel carried. This seems like a reasonable amount to cover avoiding thunderies and that sort of thing.