Interesting.
Doing a quick sample (Qty:4), it seems a lot of these wood types deliver 6400 BTU/lb.
This agrees with what I've always heard: That wood, no matter the type, has the same BTU's.......
per pound (or ton, etc...).
It's just that it takes more pieces of some wood to equal that ton.
(...and drying to an equal moisture content will be different too, etc... )
...so you still have to lift, split and carry the same ton of wood to get the same BTU's. But with "lesser" "junk" wood, it's just more pieces, more splitting, more cords, more volume, etc....
but technically: it's the same "work".
....anyone believe this? ...and shouldn't wood be sold by the ton instead of by volume? (...but who has scales? ...and you'd need a moisture meter to factor/de-rate the load to some accepted standard...yeah...that might get complicated...but would be "truer" measure of BTU's purchased)
That being said: I like to burn the hardwood hickory, oaks, maples, beech, etc...