Why is the battery life of my brand new Macbook Pro 15 inch only 3 hours 40 minutes on a full charge?

Only thing running on it is Chrome, and the battery life is only 3:38. Am I doing anything wrong?

It also depends upon what you are doing on Chrome.  Video and flash will eat up battery life.  You are probably doing nothing wrong.
You might open Activity Monitor and see what applications are taking a lot of CPU%.  Make certain that you have selected 'All Processes".
Ciao.

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