Talk to these guys. LOL
AHA, the magic of marketing !
Uniform rounds (which one would expect 20" rounds to be) is 100.48 cu ft if stacked square. If stacked like a beehive, then 116 cu ft !
To get down to 70 or 80 cu ft from 128 cu ft, one needs to cross stack rounds crookedly, one way to stretch your wood for a higher cord count , eh?
Mill it down to square pieces and it is 128 cu ft - do the math rather than relying on marketing hype if you want to be honest ?
Just like electric power tools: "Develops 2 HP", really means about 2*0.707*.8 = 1.1HP useable, huh ?