Hopefully that will motivate more people to install Linux* on their MBA. Such good hardware deserves an even better and fully tunable OS . Idle - Linux X was running with XMonad (1 workspace and 2 tiles), urxvt, Chromium (1 tab), Wi-Fi Display on: 12 .. 13 hours Display off: 16 hours Linux VT1, Linux VT7: Idle - Mac OS X (Lion) No applications launched, Wi-Fi Display on: 11 hours 720p - Linux x264 video, MKV container, muted, from SSD (ext4 on LVM), Wi-Fi VLC, HW accel off: ~3h45 (there must be room for improvement as the video was choppy, surprising for VLC) mplayer2, HW accel off: ~4h45 mplayer2, HW accel on: ~6h35 Linux VLC SW, mplayer2 SW, mplayer2 HW: 720p - Mac OS X Same, from SSD (HFS+), Wi-Fi VLC, HW accel incompatible: 4h38 Result on 720p playback: +1h57 or +42% battery life. That's on an MBA 3,2 (late 2010, 13", 2.13 GHz). I'm currently trying my hands on it before doing the same on a 4,2 (mid 2011, 13", i5). In this post, I won't go into details about power saving optimisation and what's left to do (there's still room for improvement), but I'm so pleased with the current result that I thought I would share it with other MBA enthusiasts. 12 hours is better than the highest estimate I got in OS X (11 hours). Combine that with hardware accelerated H.264 decoding that you don't get in OS X (in both mplayer2 and VLC), CPU voltage control (Core 2 Duo only), and you get monster battery life out of such a small machine. I love it . * Gentoo Linux, hand-configured kernel v3.0.6 P.S.: I'm planning on writing a guide on installing a clean, lean Gentoo Linux on a MacBook Air (both 3,2 and 4,2). In the meantime, if anyone needs instructions during their installation, I can help.