Report "I bought an envy 7645 printer. when I tried to print a few photos for the the first time, I realized the brandnew cartridge was empty after only 6 picures (8.5x11 In). then I suspected the inital cartridge might not really be full when the printer was out of the box. so I bought a new cartridge (HP 63 tricolor) for about $20 dollars. I tested printing a fe pages of photos, the cartride went empty after about 8 pages of printing this time. so I wonderwhy the printer used so much ink?!!! I would not be able to afford keeping buying the color cartridges. any advice is greatly appreciated"