Data Usage For Free eBooks From Google Play Store How much data does it take to download a free eBook via the Google Play Store? It doesn't tell you as you are installing the book. Does it take heaps in general??
You can use Data Monitor app from google play store to find per-application basis traffic monitoring. Install this app and check how much data Google Play Book app consumes after downloading the book.

Features:


  Automatic data usage measurement - simply start the app once, and it
  will automatically measure your data usage from that point on.
  Whenever you are concerned about your data usage, just open the app to
  check.
  
  High-precision data usage measurement - the app gives an accurate
  measurement of your data usage, without any inconsistencies at any
  moment. Wi-Fi data usage measurements are organized by each SSID.
  
  Easy-to-read statistics screen - measured data usage is separated by
  Wi-Fi usage and mobile usage and displayed in easy-to-read graphs.
  Data usage per app can also be displayed, so you can know which apps
  use the most data.
  
  Transfer speed monitor - a transfer speed monitor can be displayed
  permanently in the upper-right corner of the screen. Instantly check
  when and how much data is being transferred.