Yeah I've cut and burned at least a tree (1-2 face cords) each of the last 3 years. Standing dead, bark totally gone and only a few limbs still on when
I cut them out of the fence row. It cut and burned pretty fine, but splitting... holy moly! Unlike Dennis, I can't say elm, splits and nicely in the same sentence
I beat on it with an 8# maul and it was like hitting a rubber block!! Maul just bounced off. Well, I guess at least it wasn't getting stuck in the round! Finally threw it into a pile and waited for splitter rental day.
There's a great little hardware 3 miles away that has a few things for rent, including a nice hydraulic splitter. I can usually split all the "tougher than I am" pieces (BTW there are more of those than there used to be!) in a morning session once or twice a season. Costs me about $20 + fuel per session. I'm man enough to admit when I ain't man enough!!
Bottom line: as someone already noted, Elm = BTUs.