According to a browser efficiency comparison for Windows 10 version 1809 (which Microsoft posted on GitHub but never advertised), Edge remains the best browser for battery life: measuring the time it took identical Surface Book laptops to run fully through their batteries while streaming HTML5 video in fullscreen, Edge lasted 24% longer than Chrome and 94% longer than Firefox. Despite the browser’s adoption of Chromium, Thurrott believes Edge will retain this strength due to “underlying integration with the operating system.” In June 2016, Microsoft reported that Edge provided a 47 percent battery life advantage over Google Chrome. By April 2017, that advantage had fallen to 35 percent. And by May 2018, the advantage had fallen to just 14 percent. So I began theorizing that Chrome battery life might surpass that of Edge by the time Windows 10 version 1809 shipped. But that didn’t happen. So one can only wonder why Microsoft didn’t shout these results to the world as they had previously. Perhaps it has to do with the switch to a new browser engine, which sort of undermines any promotion of the old technology.