Opened on September 18, 2014, the initial aroma of the
grounds seemed to match that of a fresh can.
IMHO, the early taste and aroma of the brewed coffee was surprisingly
acceptable. In the ten days since
opening, the brewed coffee has no aroma to speak of and there now is a
noticeable stale taste. But hey, during
my lifetime I’ve had coffee that was much worse; if we were five years into an
apocalypse, I’ll bet I could muster a few paying customers.
We’ll finish using up the contents of this can, but, short
of TEOTWAWKI, I see no compelling reason for us to ever repeat this experience.
EDIT: I have been experimenting with nuking the grounds in the microwave (in a dish, not in a paper filter) for short lengths of time before brewing; it seems to blunt most of the stale flavor.
Below are some raw links on keeping coffee.

I recently opened some cans of spam that had best by dates in 2012. The spam was as excellent as if I had bought it today. (Yes there was a pun in there dependent on your like or dislike for Spam.) Same thing for canned green beans and canned corn kernels. All were good to eat and tasted as they would have had I bought them new yesterday. Tic Tacs that I bought about 4 or 5 years ago also taste the same as they would have if I had ought them recently. Honey that is a couple to few years past the best-buy dates is also sweet as ever although some of that has crystalized just a little bit.
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