Carbonized Wood is carbonized wood it makes no difference what tree it came from the BTUs are the same ounce for ounce what changes the game is the size of the pieces. Smaller pieces will burn up more quickly because of their low mass. I use the stuff from HEB that is trucked up from Old Mexico. It probably came from the same kiln as the Cowboy. At 4.87 for 10 lb it 's a good deal.
I'm a Proxy Vegetarian> Cows eat grass & I eat cows.