The Big Green Egg is a super efficient machine (from the BBQ Report - See Links)
The Big Green Egg is made of ultra-efficient, insulated ceramics. The ceramic walls are heavy and thick allowing you to grill or barbecue foods with a greately reduced amount of charcoal. The manufacturer claims that a 20lb. bag of natural charcoal will usually provide four to six months use, even if you cook out several times per week. No matter how hot it gets inside however, The Big Green Egg’s exterior is always relatively cool to the touch.
When you are through cooking, just close the lid and the top and bottom draft doors to extinguish the fire. You can reuse about 60-80% of the charcoal. When you do burn up your charcoal, it burns down pretty much to the last ash, making cleanup a breeze. The Big Green Eggs ceramic insulation also retains moisture extremely well. For this reason, foods do not dry out, as they can in metal charcoal, gas, or electric grills. Natural juices and flavors enhance the taste without the need for water or endless hours of tending. Meats and other foods are juicier, with little or no shrinkage.
The Big Green Egg: its a smoker, a grill, its an oven…
Its ability to retain heat is complemented by very predicatble heating. By adjusting the dampers, you can attain a temperature accuracy within two degrees. You have total control. A heat gauge will give precise readings of temperature, from 50° to 750°. This means you can use The Big Green Egg for a variety of tasks. You can do your grilling, barbecuing, smoking, and baking at exactly the temperatures you need.