Google Drive and Docs Tips
Make more space in a document
Reduce the whitespace in project documents
If a document isn't going to be printed (.e.g it's for brainstorming or destined to be a PDF), reduce the margins right down, and consider using landscape, so you get the most on a single page. Also use Edit>Select All (ctrl-a) and reduce the font size. Finally use View>Document View>Compact to hide page breaks.