Background

When user is online and navigates to an article, detect if the article is in a downloaded offline compilation file (or reading list), and if it is the most recent version, use that version instead to save on data usage.
The data savings will calculated and could be shown to the user.

User story

As a user with limited data and/or bandwidth, I want to know whether data is being used efficiently.

Mock of how this info could be displayed in the UI:
work in progress