Your settings, please?
All location services is turned off in the Systems Sevice (Settings > Privacy > Location services > System Servce). Only Find my iPhone is turned on. Only a few that I need are turned on.
I don't use the stock mail so I have that turned off Push (I use Mailbox). For notifications I have most of them set to not to show up on my lock screen (only phone, messages).
Brightness set to Auto, bluetooth off. I have turned Vibration off when in silent mode (seriously, nobody needs to hear it vibrate). BTW I use wifi 100% of the time. I don't use my phone when there is no wifi. So I rely on wifi heavily.