I have a Weber Kettle grill, and when I am done grilling I close the vents and let the charcoal go out. When I am ready to grill again, the used charcoal goes in the bottom of my chimney starter, and fresh charcoal goes on top. I find I can get at least 2 grilling sessions out of most of the charcoal. We do a lot of grilling, so this helps stretch the charcoal dollar. Not sure if anyone else does this, I have a friend that told me about this a few years ago. It also helps when the charcoal goes on sale around Memorial Day. I stocked up this week.