Getting all nerdy, here's the refuelling panel tucked away on the right-hand side of the aircraft just under the wing. It allows us to control the refueling and defueling (although that's quite rare), and then automatically controls the distribution of fuel between the fuel tanks (2 in each wing - inner and outer, and the centre tank). Here there's 14,100kg of fuel requested, and currently 2,500kg onboard - with it reasonably balanced 1,200 vs 1,300kg.