It looks as though I'm going to end up with just over a cord from the black walnut that my dad's neighbor cut down. The straight grained pieces split almost effortlessly but the twisty parts of the tree really tested the mettle of my Lickity Splitter-some of them seemed like they tore more than split. The thing I noticed was the really pleasant smell the wood has-I can't really describe it, it just smells good. It seems pretty middle of the road according to the btu charts (About 20 million btu/cord)-not as good as oak, but a little better than some species of cherry and maple. How about coaling?