I've installed the new Sierra beta 10.12.3 and it hasn't helped my battery life at all, still can only get about 5.5 hours on the MBP 13 w/touch bar. Have absolutely no idea how CR achieved those figures!
you can definitely get more than what you are getting now, but I agree CR #s are completely inaccurate and their testing is not real world if you ask me.
You basically have to strip out some functions of the machine. remove Siri, turn down screen brightness, use only safari and install Ghostery. Shut off BT, and Notifications. Turn off Keyboard backlight and Autobrightness. When you are done for the day shut the machine down entirely. All these things will help if you haven't done it already. If you have, maybe take it to Apple.
If I think of anything I may have forgot that I did I will repost. Poster above is correct btw, they put a small battery in these, can't get around that with Software updates. Anything new won't be out until very late next year, and there is no guarantee there either. So if can't wait you can make this one work just fine. I love mine, but I retired a very old white MB.