I ran stock rom unrooted for a month before rooting and installing xposed with the gravity box module. After running GB for a month now I can confidently say there is ZERO difference in my battery life. Nothing has changed except for my ability to tweak the look and functions of Googles stock software. Imo the best thing that has happened to Android since my Eris days!
"The mind set on the Spirit is life and peace" <><