It certainly does, but my XPS 13 lasts ~7 hours running Fedora 25 and my work-issued W540 gets around the same (this is a stupid beast of the machine that only

It certainly does, but my XPS 13 lasts ~7 hours running Fedora 25 and my work-issued W540 gets around the same (this is a stupid beast of the machine that only gets that much running Windows, a 40W quad-core i7 in a laptop isn't power sipping when I'm building something in Visual Studio or IntelliJ). It's getting a lot better as long as you're not running a Skylake chip, Haswell/Broadwell and below have pretty decent support these days.