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I have been running iOS 8 since the GM came out on Sept 9th. I attached 2 screenshots of my Usage for the "Last 24 Hours" and the "Last 7 Days". It seems the "Home & Lock Screen" has the most with 18%. In the Past 24 Hours it has also been the App Store because of all the iOS 8 updates and apps I have been installing.
 

Attachments

  • Photo Sep 17, 10 14 18 PM.png
    Photo Sep 17, 10 14 18 PM.png
    120.2 KB · Views: 57
  • Photo Sep 17, 10 14 27 PM.png
    Photo Sep 17, 10 14 27 PM.png
    106.9 KB · Views: 48
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