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I received this reply from Epson about the capacity of each: High-capacity Black (126): About 385 pages; Extra High-capacity Black (127): About 945 pages; High-capacity Cyan, Magenta and Yellow (126): About 470 pages; Extra High-capacity Cyan, Magenta and Yellow (127): About 755 pages. And the rest of Epson's reply: Epson does not provide the ink volume in mls for its cartridges because mls do not translate into any usable print information. Mls will not tell you how much printing you can get out of a cartridge. To get an idea of how much printing can be done from a cartridge, Epson provides estimated page yields for the black cartridges and color cartridges for its printers.