For some reason this ink seems to run out at the same interval every time---just like there is some internal mechanism that causes it to expire at 3 months almost to the day every time. I am pretty certain that my usage of these cartridges are some what similar over time I just can not believe that it is that exacting??Is there a time limit on the ink in the cartridge that will dry up if it goes more than 3 months in the printer??I just think that this is some type of defined obsolescence??Gerry317 354 3473