It's the Verge though.... They are the least reliable when it comes to anything related to battery. Also, I think the browser has a big impact. That reviewer said he was browsing on Chrome with 10-12 tabs got him that battery life, which is actually good for a Windows 10 tablet on chrome. I know that the Surface Pro 4 gets worse battery life. If you're on Windows 10 Edge is the superior tablet for browsing speed and battery life. It's just missing extensions.
Lisa from MobileTechReview averaged 8.5 hours and other sites I know got higher (see ZDnet, CNET, Engadget reviews). Honestly depends on what you're doing though and whether you set up your screen brightness properly. Do you mainly browse or stream on your Pixel C and what's on your on screen time?
They will be easier to compare once I get Remix OS on this thing. It's out for Pixel C, btw.