ink usage

Hello, Printing images (photos of my paintings) on my Epson P900 is using excessive amounts of Gray and Light Gray ink cartridges. I'm having to change these two at a rate probably 3:1 of any other color. When I order ink, I'm buying 3 or 4 times more Gray and Light Gray cartridges than the...

Hi, I was wondering if there was a website or program that I could upload a picture to that I will be printing and tell it what model printer or what colour channels and how many it has, and have an approximate estimation of the amount of ink usage per cartridge. It is nothing really exact just...