I always thought speed reading basics was to keep your focus somewhat centered, and you automatically pick up what's surrounding to the left and right then. That would make it seem centered titles would be best for speed readers.
But as I said, I'm ok with centered or left or even right aligned for chapter titles, as long as it's consistent through the book and nothing gets chopped off in different readers because of bad formatting. It's the body of the text where formatting is more important to me.
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