There are a number of recipes and guidlines on this board recommending how much charcoal to use for various recipes. I'm assuming the overwhelming majority of them are for the 18.5. Is there an adjustment needed for the amount of charcoal needed to produce the same effect on a 22.5? As an example, the "basic baby back ribs" article in Cooking Topics recommends 1 unlit chimney plus a 1/2 chimney starter. Would this do the trick on a 22.5 or would it start to wimp out near the end? I only use this one as an example... what I'm really looking for is general guidance as to how to modify estimated fuel needs for a 22.5.