Chrome Helper consistently uses 40% of my rMBP's CPU and results in constant fan noise.
Same on my MacBook Pro. When using Chrome, I got maybe 50 to 60 percent of the battery life I'd get using Safari. For years I had assumed that this was just how the laptop was supposed to run, until it was suggested that I switch to Safari for longer battery life.
Chrome's power usage is so astronomical that it can have a significant financial impact on the user. If you're getting only 50% of your potential battery life with Chrome, you'll go through your battery charge cycles twice as fast, meaning you have to pay $150 to $200 to replace the worn battery sooner. If I hadn't used Chrome for so many years I probably wouldn't have had to replace my laptop battery before I planned to retire the laptop.
I've now relegated Chrome to an Adobe Flash browser; I use it maybe once a month for a few minutes. Other than that I won't touch it. Don't want to wear down my battery any faster than I have to.