I'm somewhat amazed.... having read the report.
I know reasonably well what mileage my car does in town and on the motorway. Never mind the exact figures.
At 10 ltrs/100km a 50 litre tank will take me about 500 km before running dry.
The "fuel remaining" indicator on a car is never all that accurate, but when it says 1/2 it means I roughly have 25 ltr= 250 km left.
I tend to look at the odometer. When that goes much over 300km I pull in and fill up.
Now for the first time I'm towing a caravan (the equivalent of flying gear down). Suddenly, at about 300km, the "fuel remaining" indication is much less than the just under 1/2 I'd expect.
"Motorway service area ahead" (ZGR). "Next service area at 80 km".
Do I sit fiddling with a calculator (FMS) to figure if I can make it to the next service area? Hell no.
Do I pull in to the service area coming up and fill up and have a think? Hell yes.
Situational awareness is not only 3D. It's also 4D.... knowing where you are going... in this case into the service area rather than onto the hard shoulder with an empty tank.
Sorry to present a simple analogy, rather than a 60 page translation.
Oh, and to take that one step further, they could still have taken a motorway exit (GRZ) and found a local garage.