Found it.
It was from member
@Curlycherry1
http://www.arboristsite.com/community/threads/why-i-like-to-work-big-rounds.132442/
Time to drag out the photos of the scale model experiment that was run a few months ago.
Exhibit A :scale model (1" = 1ft) of 4' diameter rounds before splitting and put into a scale model firewood rack:
View attachment 462191
Exhibit B: Said wood from above rounds split and repiled into the same firewood rack. Note the change in volume.
View attachment 462193
Exhibit C: "Mixed" firewood rounds from a typical 12" diameter tree with some 4" rounds thrown in to even it out.
View attachment 462194
Exhibit D: 12" Rounds split into firewood and put back into the same rack as before. Also note the change in volume, pretty much exactly the same change as with the bigger rounds.
View attachment 462195