A lot of things can factor into this such as Facebook notifications, Twitter, email, background refresh, signal strength, etc...
I know with both my iP5 and my iP6+ I have to turn cellular data off when I am at work since the signal is so bad in the building that the phone is constantly straining to connect. It just runs the battery down fast. I can have a 40-50% loss of power without even using the phone when I am at work just because of the signal strength issue. If I turn cellular data off and just keep the phone on for text and phone calls (which doesn't use cellular data) I get maybe a 10% battery drain over the entire 10 hrs at work.
I am on day two with my 6+ and it has 16% power left.
Usage time since last full charge: 11 hrs 19 mins
Standby time since last full charge: 1 day 11 hrs
Brightness set at about 30% (auto-brightness off)
Wifi only on when at home
BT on all the time
Email set to fetch ever hour (push off)
I limit the amount of notifications I get (10 apps)
Background App Refresh (1, The weather channel)
Under Privacy Turned off the following:
Location-Based iAds
Share My Location
Frequent Locations
Diagnostics & Usage
Popular Near Me
I only allow 5 apps access to my location while I am using and one Always.
Most of my usage comes from using Feedly, Safari, email, Pandora, and text.
[url=http://i1324.photobucket.com/albums/u620/scottw324/F86E1F27-455D-4443-B24D-97AF50DD5932_zpsmtbtjp6j.png]Image[/URL]