My average seems to be about one hyphenated word every 2 pages or so. English language, justification settings in reader, left or justified doesn't seem to matter (though i convert all my epubs to justified in calibre), mostly commercial epubs, but again, converted through calibre. Big change from the nook touch which seems to hyphenate very very aggressively, sometimes seems like 1/3 of the line ending words being hyphenated.