I've had my 2011 MBA for over a year now, and I love it to death but I've never been impressed with battery life. In fact, I feel like my battery is inferior to several other people's; a couple of friends use the same laptop and they always seem to edge me on battery life. However, I do prefer the screen brightness at 75-80%, and I use Chrome as my primary browser. Based on those use cases (75% screen brightness, Chrome or Firefox for that matter), what do you guys average for battery life on your 11'' MBA's?