So I just purchased a new S40 back in October. Love the machine so far. Today was actually the first time I needed to replace an ink cartridge. For the heck of it, I cracked the "empty" cartridge open just to see what's going on in there. To my surprise, the ink bag inside the cartridge still has a fair amount of ink in it. For a 700ml cartridge, I'd say it has AT LEAST a good 100ml (if not more) left in the bag. At $155 for a single cart, that's like $22 or more going right in the trash! I understand that cart volume is probably mostly determined by the chip, but this is still somewhat frustrating. Anybody know how I can maximize the ink usage so I'm not throwing money in the trash? Is this by design? Maybe they assume the last 100ml has a higher potential for contamination/sediment/etc? I do shake my carts usually about once a week. Any input on this is appreciated.