Originally Posted by Indigo121
This works. The problem is that the Nook simply spaces out the words more instead of cramming more into the line. i.e the number of words are the same in each line, the spaces just grow.
That sounds like "justification." The space you're adding by reducing the margins is not quite enough for the justification algorithm to move words to the previous line(s), so it adds more space between the words. Does the Nook do hyphenation?
You could try turning off justification on the device if that's possible, and/or change the body-text alignment in the epub from justified to "left." That will, of course, result in space at the end
of a line (ragged-right), rather than between the words, so it might not result in a change in the overall number of words per line.