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I'm considering purchasing a new Macbook Air, and one of my main goals would be to maximize battery life. If I upgrade the standard processor (from 1.3GHz Dual-Core Intel Core i5 to 1.7GHz Dual-Core Intel Core i7) or RAM (from 4GB SDRAM to 8GB SDRAM), by how much should I expect battery life to be reduced? Would it be only when using all of the RAM / processor power?

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