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 slightly smaller font, to save on page turns and thus battery life. I don't take it to an extreme.