I burn them all, but most of next year's wood will be sugar maple. I had one dying sugar that I had to take down last fall because A new shop I was getting would have been in jeopardy. That tree was no longer good to make saw logs or I'd have sawed them. So far I've cut and split maybe 1/4 of the tree and about half that much again will fuel my evaporator for the next season. I will also be burning some hemlock slab off my sawmill.