I'm a saver and a user. No matter which grill I'm cooking on, when i'm done I shut everything down, lid vent tab at the "4:00" position, its a weird thing with me.. and I save it for that grill for the its next cook. But after a couple grill rotations as I'm prepping for a cook on a certain kettle, It dawns on me that between my 18 and a couple 22's I have an almost full chimney's worth between them and then I get them all combined. I always top off with some new briquettes, but there are times that I just want a fresh chimney. I mainly use KB and sometimes Cowboy (its ok, but not great). In recent times I have dialed it down from a full chimney to a 3/4 or half chimney.