Originally Posted by DrNefario
I don't mind either way, but if you have a blank line between each paragraph, you will end up turning the page slightly more often, because you're getting fewer lines of text on a page. This is going to be slightly worse for your battery-life. (Font size and line-spacing will also be a factor, but your eyes are probably more important than your reader's battery-life.
This is why I tend to use a bigger font, 1.2em line spacing, and space between paragraphs. Because I value my eyes more than my ereader's battery.