My phone has been running on the extended battery for 22 hours and 15 minutes. Battery is down to 2%.
Yesterday afternoon, I disabled data synchronization for everything I don't use (books, G+, photos, etc) and left the phone on 3G. The phone spent the night on WiFi while I slept. Steamed Pandora w/Bluetooth on my way home from work yesterday and then again this morning on my way to work. Spent some time on the phone last night. Other wise a fairly light day of data use. Mainly just a few emails, IMs, a little web browsing (maybe 20 minutes), no GPS (it's also been off).
I just disabled NFC and Android Beam. Didn't think of it yesterday (thanks SuperChargedJ).