So when I looked at 13:00 it should have been showing a total usage since the last charge of about 5.5 hours. So it looks to me that the real problem is to do with the phone getting confused and deciding not to recharge the battery even when it can.
It doesn't work that way; if power is connected, and the source can be identified (adaptor with the correct ID pins so the phone can determine its current limit - ie any iPod-compatible one, or a host) then the charger is enabled.
Usage only resets on *full* charge - ie, it has to get to something like 98%+ for it to reset the counts.
I'd be interested in seeing the numbers if you didn't plug it in in the car one day - from your description it sounds very much like the exchange activesync server it is talking to is misbehaving in some way and keeping waking the unit. This type of thing is kinda annoying as you don't ever "see" the wakes as they're just server activity, even though firing up the 3G data link is kinda costly, power-wise.
The other thing to try would be disabling the activesync mail account for a day as an experiment...
Hugo
(speaking personally, not for his employer)
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