'What we do know is that a helicopter ended up in the drink with both engines operative'
Does that categorically mean the Heli still had enough fuel?
I mean you can run off the road on a car with fuel in the lines still pulling you until impact but that doesn't mean it can take you another 10 miles.
How accurate are the gauges, does inaccurate weights have much of an impact.
From my time offshore in the past, the truth is figures passed on weights are rarely accurate