People go to such great lengths to extend laptop battery life—going blind staring at dimmed screens, developing repetitive stress injuries by ditching mice—that they miss the obvious. Like browsers, which apparently have a huge impact on battery life.
Seeing as laptop users have a browser open pretty much at all times, AnandTech ran exhaustive tests on Windows machines, Intel and AMD, netbook and notebook, to see if switching browsers made any difference in how long batteries hold out. And hey, it does! In some tests, there was a 30% advantage between the worst browser—always Safari—and the best—Internet Explorer 8. Seriously.