What part of the country are you in and what kind of wood do you usually burn?
I'm in Redmond, Oregon. We mainly have lodgepole pine, ponderosa pine, juniper and almost no hardwood.
The lodgepole is what I burn. Ponderosa has a lot of bark so you don't get as much heat producing wood per cord and juniper doesn't stack worth a darn. Wish the lodgepole produced more BTU's per cord.
N.E. Oklahoma.
What I have on my property. Mostly elm, hackberry and oak from storm damage.