WordPress › Support » Full-text feed and the tag:

It took me a long time to figure this one out, it is actually easier than it seems.

Open up wp-includes/post-template.php

Find the line that reads (it’s inside the function named get_the_content):

if ( preg_match('/<!--more(.+?)?-->/', $content, $matches) ) {

And change it into this:

if ( preg_match('/<!--more(.+?)?-->/', $content, $matches) && !is_feed() ) {

And now you have partial posts on home page and a full feed!

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