Anyone every tried a trick I saw for stale coffee called brightening?
Take remaining coffee, say 3 cups or whatever, and pour it back and forth into the carafe he same number of times there are of cups, 3 for 3. Raise carafe above cup farther and farther away much like you see them pour in making Thai sweetened tea. Supposedly it re-oxygenates the water.
Does taste better the times I tried.