so the 1,159.2 is the mass? so if my engine say the optmal mass iss 798 have more mass than the optmall
The lowest mass number is just the ship hull with no modules fitted.
The middle mass number is the ship with current modules fitted prior to any cargo or fuel.
The highest mass number is when fully laden (i.e any cargo modules are all full and this ship is also fully fueled).
None of these are correct.