Unlike many of y'all, I burn my wood "longest" split to "youngest" split; as I've not reach Nirvana yet...........................to be 3+years ahead on CSS wood. Anyhow; I'm into some ash now...........2+years CSS............very, very, different burning characteristics from burning mostly box elder and silver maple this Winter. Doesn't seem to burn as hot/fast, but it sure burns longer, and my flue temps are lower as well. I love my ash!!