Overstates number of pages per ink cartridge

It's a decent printer. We have had it for almost two years and have only used it lightly. However, it is now telling us that the black ink is low and we have only printed 300-500 pages max. I was unable to find any information in the users manual that would explain the huge discrepancy between 2400 and 500. Customer service was no help- just talked in circles with no good explanation of why the ink is already running low.

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