What can i do if the battery doesnt last me 6 hours?

my macbook pro is a 15 inches 2,3 Ghz, with mountain lion 10.8.2
i know what all the answers will say, check activity monitor, well the highest activity is kernel_task with 3.8% and im noit going to delete that process or ill be regreted..
any ways, my keyboard light is off, the brightness is the minimum, and the bluetooth is off too.
the battery is lasting me no more than 4 hours, 3.5 hours is the major times..
what can i do?
im charging the mbp everyday!!!! and i bougth it in august 23

First, document the battery performance by charging your MBP fully, pulling the power adapter, setting the Brightness to 50%, max out Energy Saver (set both to Never), and switching on Safari. Don't turn on any other process. This is one way Apple determines if a machine is using too much battery. Under these conditions, you should be getting seven hours.
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