When last I checked I was at 2138 ml of PGY for 30,000 square feet, or 6.5 330ml cartridges, or about 0.072 ml per square foot. I print mostly matte canvas.
So by simple math I would expect you to be at 82ml for 1150 square feet. Something doesn't add up.
Maybe there's something wrong with the ink sensing. Did you save the used carts? A simple shake test can detect any remaining liquid. For every cartridge the printer has told be to change I have never felt any sloshing. An empty cart weighs roughly 112 grams.
The printer uses about 1/2 of each of the carts to prime itself at startup. The reporting of cartridge status on the initial set of cartridges is not correct on the 8300. I remember that several carts went from apparently almost full to empty in very little time. But for the second set of carts on, all was correct.
For normal color printing GY and Y are used at more than twice the rate of PGY.
OK, so not much help. I wonder if you have a wiggy profile? All that PGY ink must be going somewhere other than the maintenance tank which would otherwise be full by now. Do your prints take a long time to dry? Have you looked for leaks in and under the printer and along the black suction panel under the printhead path?
