Battery Life on Web Browsing using Wifi only 3 Hours, how to expand?

I am using MacBook                         Pro, Mac OS X (10.7.2), 2010 4 Gb, 2.66 Ghz Intel Core i7, 15 "
Battery Health=92 %
            Cycles=491
Using firefox on wifi, the battery lasts only 3 hrs. (Only Browsing and some downloading).
Any tips on expanding the battery health,life and its time.

User Tip:  Apple notebook batteries – maintenance and troubleshooting

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