I haven't been able to get more than 3-4 hrs out of my 2011 MBA... I run without bluetooth, time machine, 50% brightness, and I disabled everything in my dashboard. I check the activity monitor and only run Chrome, Mail and one system monitor. I closed mail just to see if it was the biggest drain and I gained about an hour and half additional battery life. Is there anyway I can run mail and still obtain at minimum a 5hr battery life, with chrome and at 50% brightness?