What you can do is to look at Steve's Digicams and DPreveiw and see if they note anything derogitory about battery life.
There are factors that will give you battery mileage that you will never be able to get what you found. Such factors are:
2. Age and battery wear.
3. User influences.
- They use the zoom a lot.
- They use the LCD display.
As such these numbers may mean nothing in the real world and as such would only drive up the cost of the camera and possible line pockets of the standards holder.