How is everyone able to talk about their device's battery life as if they are doing the exact same thing with it each day? Unless you are doing a controlled experiment, you are using your phone differently from day to day.
I'm not. But I don't have internet at work and during downtime I use my iPhone for strictly 3G usage. Even if it's not completely accurate the fact is that I'm getting better usage now than I was getting 2 weeks ago with similar usage.