Is anyone actually getting 7hrs of real-time battery life out of their Air? I have the i5 MBA13 and my battery meter tells me to expect 4.5 hours out of it. I've never actually timed it but it can't be seven hours. My computer is on almost all the time at work and I'm there longer than 7hrs and I have to recharge it before I leave. I'm not encoding video, Skype chatting or anything. My email is on and MS Office is open. I'm browsing the internet but just reading, no YouTube or other flash videos. Any idea? I let the OS take over the whole brightness of the monitor and everything as well. Its usually at medium brightness.