Scuffers,
They did not start with full fuel, they started with 400 Kgs. Full fuel on the 135 - dependent on serial number - is around 540 Kgs.
Ah, OK, thanks for that, missed it somewhere...
That still leaves the question of if you start with 400Kg's, as a pilot, you must have a good idea how long this will last for?
does the CAD display not give a consumption rate and fuel time?