Thanks Richard. I do believe I might have a little better efficiency by adding a damper but so far I am very impressed with the performace and heat value from the coal and my particular set up.
I burned 100s of cords of wood over the past 35 years and have to put this in perspective. I went yesterday for my coal, 100 miles round trip over to Honesdale PA and got just under 2.5 tons for a little over $500 @ 219/. Spent most of 2 full days getting it binned and ready for the season. I would need at least 5 full cords of wood if I still had the Big Moe Allnighter stove and that would require many, many more hours, dollars, equipment, space and lots of very hard work.
I did the math a while back and honestly wish I could go with a bigger coal stove but will have to be happy with the one I have and the nice heat it produces at a fraction of the total cost. The fewer of my dollars that end up Arab hands the better I like it!