I have a 2012 MBA 13" and after upgrading to ML I've noticed a significant decrease in battery life. It's getting really annoying considering the fact I was able to last a solid 5 1/2 to 6 hours of normal use prior to upgrading. Whats the cause of this? Anything that can be done? Every other minute i glance up at the percentage and its 1 or 2 percent down from the previous number. Also if your just home and you want to use the computer, whats the best way to do this, by leaving it plugged in, using straight up battery, or using the battery untill it reaches 75% and then charging it fully and then repeating? I know other people have got to be having this problem as well and it worries me because this computer is brand new. Thanks.