11 hours, 4 minutes off battery.
Battery at 75%.
Using the phone more than I used my Droid 3, which typically ended an 18 hour day at about 35 to 55 percent.
I'll post a screenshot later or tomorrow. One day is not enough to fully judge.
However, one more data point. Last night I went to a local restaurant where there is a terrible signal. Arrived with the phone at about 70% and left with it after two hours at 53% (sent and received a few texts and received emails and twitter updates in Plume every 15 minutes.) Last week I was at the same restaurant for the same amount of time. The Droid 3 was at 65% when we arrived and the battery died before I left - the second time in the 22 months I owned it that this happened.