Oh my gosh! Way 2 coincidentally, I was thinking the same EXCEPT calculating the use of ground, canned coffee.
In my case, the reason this came about, was because I took a leap "backwards", if you will, and purchased an ole-fashioned percolator on Ebay. I think the coffee tastes best when fresh "perked." In addition, I don't need to use coffee filters, or would I forget that the coffee pot is on for hours (as could happen with a Mr. Coffee type system.
We go through one can in about 8 days. Am trying to stretch this out by alternating hot tea instead. We shall see. The only chance of me getting coffee stocked is on sale/or with coupons. Paying it straight up in the northeastern part of the country is insanely high-priced! So I do consider it a treat.
Bravo to all of you keeping track and thus reducing expenses!
Janet