Hi.
The following might be a guide to a solution of such problems:
The battery of the MBP has a capacity of 8460 mAh. That is if the computer "consumes" 8.5 Ampere (A), then the battery lasts 1 hour (h). If the computer consumes 4.25A, then the battery lasts 2 hours. If the computer consumes 2.8 A the battery lasts 3 hours. If the computer consumes 1.75 A the battery lasts 5 hours. If the computer consumes 1.2 A the battery lasts 7 hours.
Instead of doing lenthy tests you should just have an eye on the amperage (power drain) and try to adapt you configuration.
Example: I noticed that my MBP Retina (2012) lasted about 3-4 hours on battery, starting fully charged. Using some battery utility I found that is was consuming 2.0 A to 3.0 A. Opening the console app I found that there was a log message generated repeatetly by some app (tens of messages per second). (Note: The app was Growl, which was compaining that it could not open a window). Fixing the problem, the power consumtion was reduced s.th. below 2.0 A (to around 1.7 A, which would corrspond to 5 hours). I assume that the log messages where constantly nagging the SSD. Note that you hardly notice this type of power consumption by looking at the CPU
Monitoring the amperage gave me s.th. like an App's power consumption. Some apps, which I believed to be idle (even if there are idle on CPU), were not.
If you find a usage pattern which consumes only 1.2 A you will have your 7 hours.
Best
Christian
Note: You can view the power consumption with the System Profile (Apple Menu -> About this Mac -> More information -> Power).
PS: Running Mountain Lion 10.8.1.