OK, been burning since the beginning of the month. Pine slab bundles = .78 cord for $10.00. Since I have a BKK, I've stuffed that sucker full, then turned down the T-stat. Low and behold, this crap is giving me wonderful burn times with decent heat output. 180 °F stovetop after 20 hrs.+. This is just a note to BK owners, I don't know what slab wood would do in a different stove. If you have a BK, give it a shot, you should be able to save the good wood until you need it.
Edit- This is 90% N/S loading.
Edit- This is 90% N/S loading.