I'd really love to get a definitive answer to this, too. I've had my phone for almost 3 weeks. Looking at my usage right now, I've been on battery for 15h 5m. My #1 consumer is Maps, at 19%. And I haven't even opened Maps today (except to open it and hit Back until I exited out, which only took 1 press)!
On the plus side, I'm still at 40% battery! So, if I could get the Maps usage down to something reasonable, my battery life would be incredible!