How come my battery on my new MacBook Air 13 in won't charge to capacity?

The first time I turned on my MacBook Air the battery had about a 5 hour charge to it. After that it will only charge to about 2 1/2 hours max and it says that it is at full charge. I thought the Airs had a 7 hour battery life. Is there something I need to do differently? Does it take a few charges to get at full capacity?

They have an UP TO 7 hour battery life.
The higher the load you put on the battery the quicker it will be depleted.
Turn off bluetooth.
Turn the screen backlight down to as low as you can stand.
Turn off the keyboard backlight.
Don't visit websites that are coded using flash.
Don't view video.
You only get long run times when you use the cpu very lightly.

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