The Canon imageCLASS MF455dw's high-yield black cartridge delivers 10,000 pages — the standard gives you only 3,000

The MF455dw uses Canon’s 069 toner, and the gap between standard and high-yield is worth paying attention to. The standard 069 black runs about 3,000 pages; the 069H high-yield bumps that to 10,000. That’s more than a 3:1 ratio for a modest price step-up, so unless your print volume is genuinely trivial you’ll save money per page by going straight to the high-yield cartridge.