Update from earlier post:
When I first upgraded to iOS 7, my battery life was perhaps 25% of what it was before the upgrade, and the reported charge would make huge jumps (generally downward) with no correlation to usage.
Since then, my battery life is restored to perhaps 80% of the pre-upgrade life. I think the most significant factor in restoring the reported battery life was letting it discharge about six times, all the way to shutdown, followed by a full recharge. I assume this reset the battery calibration. Another factor may have been updating all my apps - I don't know whether this is truly a factor, but it is possible that some apps were bad actors before updating.
I noticed that while WiFi seems efficient, even brief Internet access using the cell network significantly depletes the battery. I'm not making special efforts to close apps.
Current configuration
version: 7.0.3 (no change either way moving up from 7.0.2)
Background app refresh - off (in Settings / General)
Auto downloads - all off (in Settings / iTunes & App Store)
WiFi on
Bluetooth on
Location services on, many, but not all apps enabled