The results are interesting, here's what I think: we should avoid blank lines between paragraphs in the source of the e-books BUT reading system should allow us to tweak the spacing between paragraphs. In both Mobipocket and ePub, this can be easily modified using CSS properties.
I might extend also at some point the settings for customized PDFs on Feedbooks with "advanced settings" too, this could be one of the options available.
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