I actually have been blown away by the battery life I have gotten so far (see screenshots).
A couple of things I do may help. When I first get any newre chargeable device, I charge it fully, then use it until it is almost dead (1% in the case of the gnex) before charging again.
I also use the mobile network for location services instead of the GPS. This saves battery and works just as well for my uses which are using the locale app and google maps for traffic updates in the morning.
I have all updates active - gmail, fb, etc. This is my experience and methods with screenshots for evidence of my typical use that people can compare to their own. I'm extatic to be getting such great battery life. From talking to a friend with a vzw gnex, I was sure I'd need the 2100 mah batt. I'm happy I can stay thin now lol.