With regard to fuel contents, at least things have moved on a little.
With the police helicopter I flew, with a crew of three, we could only ever take off with half tanks, for reasons of all up weight. The fuel used to be dispensed in litres, but the RFM figures were in Kgs. However! The fuel contents gauges were marked in per cent (yes, %).
To make it easier at base, for rapid refuels where I knew the fuel flow of the dispensing pump, I used to refuel using the second hand on my watch.
Worked every time.
ShyT, one question. How often was the pump flow rate checked? Pump capacity can decrease over time. ?????