I have suggested that properly sizing the Jump Break and Title sections of each post is an important decision, when publishing a post in your blog. Publishing this blog, using carefully sized post title and jump break sections, allows me to consistently publish posts, with maximum detail visible in main page view - and with the "Read more" link visible. Potential readers may read a post in this blog - instead of returning to a SERP , and reading another blog. This affects a key reader retention metric, the " bounce rate ". All of that considered, sizing of the introductory post sections won't always produce predictable results.
What Blogger won't tell you