New Macbook Air with bad battery life

I've got a new Macbook Air (2013, 11-inch) and I upgraded the RAM and the processor. I'm only getting 6 hours max from the battery, which is disappointing because I wanted to be able to do a day's work without a charger. I've already sent one back and had it replaced, but the new one has the same problem. I've done a call with Apple Support, where they directed me to the help article I'd already read. I've checked Activity Monitor and killed everything I can. I've turned off Bluetooth as well. I use Chrome a lot, Tweetdeck is running, but neither of these things I'd expect to result in a 6 hour battery at 100%.
Does this sound like normal performance? If it's the processor speed, I'd be tempted to return this one and downgrade the processor as battery life is more important to me than speed (my work is mostly online anyway).

Quit Chrome and try Safari for a while. See whether there's an improvement.

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