some pro-100 ink cartridges run out much faster

[ccu336]

I bought a pro-100 for several years and only printed very few photos. Just found today that Gray and Photo Magenta are running low. From the ink details page, those 2 are less than 10% while all others are about 80%. Any idea what's the cause? Thanks.

[jrhoffman75]

The photo inks - cyan and magenta - are used fastest with my Pro-100  It all depends on what you are printing. 

I used to have a Pro-9000 that had red and green inks instead of the two grays of the Pro-100.  The red and green  seemed to last forever.