Phase 5 and later software will give the progress page fuel in kgs not tonnes and decimals of....which as pointed out can be almost 100kgs different from the actual.
The process outlined by Adroight is the only other way to get a figure without the later phase software.
But as mentioned the system is so useless that it can't work out leg tracks Vs the expected G/S based on the TAS you are currently on
and calculate the end fuel for each leg and the whole trip.
Unlike practically every hand held SATNAV system for the last 2 decades.
