I am a photographer making a proposal for a grant/purchase award and need to estimate ink costs for well over one hundred prints. The prints are all color landscape aerials and will be printed on an Epson 2880, probably on Harmon/Hann Matt cotton smooth. It would be hugely helpful to have a rough figure for ink cartridge use. I'm aware images use different amounts of each color, but cartridge costs are uniform so it seems reasonable to expect that coverage in number of cartridges per, say 25, 50, or 100 sq feet are out there somewhere. A rough figure is fine. Epson on this: "We get this question regularly, but unfortunately we don't have that information and we don't have a source for that information." (We get this all the time but we don't have a clue!) Any takers?