Is there a way to find out the total number of pages I have printed with my Canon MX870. I print very little and most of what I print is B&W. I have probably printed fewer than 100 pages total. Now I'm getting a warning that my color cartridges are low on ink. They are the original cartridges that came with the printer. Do they have less capacity than the ones you buy or is this typical of how long they last?