I'm surprised people are getting 8 hours on their iPhone 5 with LTE just as Apple states but I only manage to get 3 hours with lots of web browsing on 3G so I'm guessing brightness level is a huge contributing factor to this.
I never think about any of this crap. I just get the phone and use it. WiFi always turned on. Bluetooth always turned on. Auto-Brightness turned on.
I take my phone off the charger at 7:45 am. When I am getting home at 6:30PM, I still have 65%-75% battery.
This is sending about 30 SMS/iMessages, reading a few emails, browsing a few sites on my lunch break, taking a few pics, checking sports scores...