Why was Tiger's full-load displacement so much greater than her standard displacement?
Short answerMost of the difference came from fuel and water, including roughly 1,850 tons of fuel, rather than a concealed ammunition load.
NotesThe gap was not evidence of a hidden wartime ammunition allowance. Fuel and water account for most of the roughly 2,150-ton increase from standard to full load. Tiger could carry about 1,850 tons of fuel by herself. Reading displacement figures therefore requires checking which consumables the stated condition includes rather than comparing the headline numbers as if they described identical loads.