Simply put, does 10.7.2 provide any improvements in battery life? I know Apple didn't say a word about this, so I'm looking for user experience. I had to go back to SL on my 2010 13" MBA because the battery life was unacceptable. I barely got 3 hours when doing normal browsing. SL still gets 6-7 hours easily. Any insight? It doesn't have to be 7 hours, but even 5-6.