Seems to me that they didn't actually have a valid fuel 'plog' - they just changed the destination in the FMS and accepted its calculations.
Interesting items in the report are that the F/O tried to present the Capt with the gear down ferry tables early in the flight but was dismissed with the remark that they were for pre-flight planning only; the F/O effectively took the initiative when the 2nd engine flamed out and the reason the aircraft landed on the grass was that the 'Land Recovery' system was not activated so only partial flight controls were available?