According to a study by TÜV Rheinland, inkjet owners are taking the advice of their printers, throwing out cartridges when the printer says they’re empty. The problem? They aren’t really empty. In fact, the cartridges are over half full when thrown out, and may still have hundreds of pages worth of ink left. I personally run my ink supply into the ground, printing until my pages are streaky and faded. If you use this method, always have some new cartridges in supply.