Do I have a dodgy battery?

My 32GB 3GS is a month old. I'm very happy with it, other than the battery life. I'm wondering if I'm expecting too much from the battery, as I'd get nowhere near the battery estimates on the Apple site (http://www.apple.com/au/iphone/specs.html)
For example, when I went to bed last night I put it on charge and I woke up during the night and saw that it was at 100%, so I disconnected it and went back to sleep. When I woke up a few hours later it was at 78%, having been locked and unused the whole time. I don't have push mail on, and my fetch is set to manually.
Is this normal or should I be contacting Apple (as it's still in warranty)?
cheers,
Ian

Just for anyone else wondering the same thing, here's an update. I don't have an Apple store in my city, so it's not that easy to just go and get a replacement. However, I'm not convinced that I actually have a battery problem.
I did a couple of things which have doubled my battery life. Firstly, I turned off push notifications because the only app I have which has push notifications is one that I don't really care about receiving notifications from. Secondly, I turned off the location services (GPS) because there's no point in having it on all the time when I can just turn it on when I need it for maps etc. (Obviously if you have MobileMe then you might want it on for the Find My iPhone feature). Bluetooth was already off and can be switched on as needed. I left the WiFi on even though most of my weekday I'm not connected, because it would be a hassle to have to toggle it when leaving/arriving home.
Anyway, simply turning off notifications and location have given me basically a 48-hour charge, with fairly high use.
Try the above before returning your phone. I hope that helps someone else with their predicament. Thanks all for your replies.
cheers,
Ian

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