Somewhere here is a dirty joke about wood, wood never being large enough and whether two inches makes a difference or not . . . but I'm not going to be the one going down that path.
On the serious side, never been one to pack every cubic inch of the firebox full . . . always found it nice to have a little bit of wiggle room since most of my splits are not perfectly square or rectangle and add in a bit of uneven ash at the base and it's nice to be able to have a couple inches of room to move things around a bit . . . but that said . . . I try to cut my wood 2-3 inches shorter than the max length. It works out for me.
On the serious side, never been one to pack every cubic inch of the firebox full . . . always found it nice to have a little bit of wiggle room since most of my splits are not perfectly square or rectangle and add in a bit of uneven ash at the base and it's nice to be able to have a couple inches of room to move things around a bit . . . but that said . . . I try to cut my wood 2-3 inches shorter than the max length. It works out for me.