Newsblur has a setting per-site which allows you to have it use either the feed body or attempt to pull in the full text. When I was commuting on the subway (prior to ubiquitous underground coverage) here in DC, I used that heavily. One nice thing is that downloading it on your client avoids the site having to get in the middle of the copyright concerns about replicating their servers.
nice! I've been using newsblur for a few years now but I've never delved into the settings. is this option only available on the web version? i can't see anything on the android app