I tend to read my RSS feeds on the London Underground, where signal is non existent in the tunnels, and patchy in the stations. My app of choice (newsblur) lets you sync your feeds for offline browsing so I do this before heading home.
Unfortunately a lot of feeds I subscribe to tend to truncate their articles with a summary or maybe just the first paragraph, with a link to continue reading the full article.
I get why they do this, getting people onto the site gives a greater opportunity to show ads etc, sites gotta be funded somehow.
A few years ago I wrote a tool that ingests these truncated RSS feeds, visits each new link in the feed, and then uses a text extraction library to pull out the full text. These full text articles are then supplied as a brand new RSS feed for my client to subscribe to.
I felt really guilty about it though and wasn't sure about the legal implications of it