Uhm, if max. fuel on the real aircraft is 14t, and your MS add-on is 'accurate enough' by displaying a quantity of 20t, I think that speaks for itself. You don't enhance that perception, when you don't seem to understand the problem with a 29t MTOW and a 20t fuel weight. Have you considered what the aircraft weighs without volatiles? Or what the weight of 4 crew members, 12 passengers and their sustenance comes out at?