stacker question

Why do most use 2 stackers no matter how little meat they smoke?
Do you use less charcoal using 1 stacker?

Thaks......JJ

I don't, I use as many stackers as I need for the amount of food I'm cooking.
I don't believe it will save anything on Charcoal by using less stackers.

I also wouldn't use any more stackers than I need to cook the meat. I'm not sure why anyone would use more.

Mack, Mike,
so you are answering that if you have to cook - let's guess - just one pork butt you would cook it in the first stacker on the grill just over the water pan.

But if I can imagine that the temperature inside the excel would be almost the same if measured on the lower or on the upper grill - let's suppose we have a excel with 2 units stacked - (that's something I have measured, finding a gap of ~+3% at the lower grill level) I think the humidity rate is very different between the 2 zones (but this is something I haven't measured yet).
the closer to the water pan and the higher humidity you get.
what's best?
If I'm not mistaken I think that the higher the humidity the more tenderness you get (meat is loosing less liquids because of the vapor saturation all around) but the less effectiveness of smoking.
isn't it?

ciao ciao

zino