Chrome is a power-whore. I have one of those Core M machines that sips power and can run about 10 hours on battery if nothing is running really. In this state with the screen down the whole laptop draws about 4-5 watts, but the minute you switch on Chrome 6-8 constant. It's all the phone-homing, syncing, and other stuff that is constantly running in the background that draws the power. Now this is about a 30-50% increase in use so for these types of computers this is a massive test increase in draw. I was measuring this with idle pages as well. You will find chrome is nearly ALWAYS running and doing something even if you sitting a web page that hasn't moved for an hour.