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That issue is a little cloudy, due to the fact that Mt. Lion 10.8 and possibly 10.8.1 seemed to eat more battery, which seems to be fixed in 10.8.2.
 
I don't think the .2 bump is worth the price, but you should go and get the 8GB of RAM IMO.

Price is no object it's a work laptop I'm getting for travel and in field use to edit and manage presentations.

Battery life is a priority though, I'm getting a retina MacBook for the hardware intense work. I currently have a 2010 2.13 ghz maxed out MacBook Air.
 

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