This was my worst battery day - it was on Saturday. After a bit over 18 hours, I had about 18% battery life left, with less than 2 hours screen time. I did do about twenty minutes navigation in the middle of the day (the first small steep decline in the middle of my graph), but the thing that killed it the most was sitting in a restaurant in rural NH for two hours, where there is a very, very weak signal and the phone often flips between 3G and 1xRTT for data.
On my last phone, it would have been dead within an hour at this restaurant. The battery on this phone is great, but a weak signal is a killer.