[GeoffR]

Originally Posted by arspr

Either you, or much more possible I, are doing something wrong...

I'll post a simple test book because there cannot be such discrepancies in such simple tests... But not today, I'm going to bed.

The difference with the kepubs results could be that I am adding margin/padding to the device's built-in stylesheet, rather than to the book's stylesheet, and testing with synced kepubs.