2/3 movement.

[treadasaurusrex]

They do, and darn quick, without having to be told to do so. Think "big picture," old boy . . . excessive details spoil the fun.

No body calculates main gun ranges, or driving distances, or fuel expenditure in thirds. Our gunners. prompted by their high-speed computers say things like, "Target identified, enemy BMP, at 1600 meters, load HEAT."

No one says, "Gosh Sir, that T-90 is at 2/3 of our maximum effective." Or --  "Oh my, the indirect approach distance is 635 plus 2/3."