Hi; I pay extra for "premium" coal, from an above mentioned dealer. He tells me that the coal is analyzed by a lab at Penn State and has high BTU content. I suppose that I'm taking his word for it, as I've never seen this analysis. Comparison is a little difficult, as there are many varients. A coal that burns great for me may very well not be acceptable for someone else. We would have to consider stove make, location, weather and other stuff that I'm shure to have missed. In my 28 to 30 years of burning, I have only used two sources. In that time, for one season only, I used coal from Mocanaqua Pa. That turned into a learning experience for me. Ash and clinkers, lots of slate, and above all, while it did burn there was noticeably less heat output. I was happy to burn the last of it and immediatly went back to my normal dealer for the following years supply. At that time I had a 3/4 ton truck and did my own hauling. Now I have it delivered. And I use P. Chervy out of Plymouth Pa.