My 4s, with 3G constantly on and push notifications off and some location services off, gives me about 13% an hour. If my 3G is off then I got about 11%. The 2% difference is not that much, so I leave 3G on. And I am on ios 6.0.1. What helped me was the draining to 0% and full charge for2 - 3 times. Before that my usage was 18% and more.