I have it off. Only have it half way. How does it only give me 4 hours or 5 hours of usage in half a day. I'm already in 22%
This shows you are really using the phone with screen on for 4 -5 hrs.
Don't be bother by other people's stat which give you 10 to 13 hours which just tell you that they have the phone in the pocket most of the time.