Feeds are a great way to reach a broader audience. However, the problem with feeds is that it's never been possible to control exactly how much content is delivered. Up until now, the options have been "Short" and "Full". "Short produces around the first 400 characters, with HTML and images removed. Full produces everything." Well Google added a 3rd option into Blogger that lets you provide your users -- an image or two with some introductory text just by using Jump Breaks.
Next time you write a post and use a jump break, anyone reading the feed will get all the content, including images and HTML formatting, up until the jump break (if there's no jump break, feed will contain everything).
If readers want to see full post, they can click "read more" link.
To enable this feature, simply go to Settings page, click on Site Feed, and then next to "Allow Blog Feeds", change the drop-down value to "Until Jump Break".