MBPr 2012 15" 2.6ghz: battery not lasting more than 3 hours

Hello there,

I have been having bad battery performances for a while now. I even took it back to the Apple Store and they gave me a brand new one, but I still get bad results.

Right now battery is at 27%, screen brightness is at 50%, I have firefox running with one tab, email app and utorrent: one hour left. Usually when it's at 100% with only firefox running I get 4 hours max. I used to get 7-8hours!

I have gxf so it's not a graphics card issue. I tried resetting the SMC via Terminal as well as the key combination at startup. Nothing worked. C.

Thanks a lot for your help!

Running OS X Mountain Lion 10.8.5.