I think 720 is too much for most readers. 760 is more reasonable. Reading apps are often on touch screen devices so the status bar can generally be removed to be reinstated with a touch of the screen. Too large an image will generally be shrunk by the display program so the aspect ratio is more important than the actual pixel size. Today with higher resolution screens and some readers offering a zoom feature it is likely best to go with a bigger display and let it be shrunk. On most devices using an SVG wrapper around the image will guarantee a good fit.
Dale
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