My car has 75 cubic units of space. But 50 units of that are taken up by the engine, dashboard, heater, steering wheel, door panels, insulation matting, seats,

My car has 75 cubic units of space. But 50 units of that are taken up by the engine, dashboard, heater, steering wheel, door panels, insulation matting, seats, spare tire, etc. So there's only 25 cubic units left for people and carrying. But sure, 75 cubic units.