I was shocked at the rate my iPhone 5 discharged; compared to my 4S, there was no comparison. The 5 was discharging at an alarming rate. Like dead by noon rate. Scary!
I researched it and saw others were in the same boat. So, I went in and turned off everything that was location-based I could live without.
One was LTE, it is not available in my area (Columbus, Oh) with AT&T yet.
Another was the location settings in the camera; I turned them off, too.
Set my mail to not push constantly, but I could manually check it just by opening it up. Works for me.
Lastly, I turned my screen down to approx. 85% of total brightness. You can still see it really well, I hate dim screens.
And now, after 2 1/2 hours, it's still at 96%. What a huge difference!
So try it; turn off everything location-based you can. Hopefully it will work for you, too.