> Just a single YouTube video in a single firefox tab will bring you up to at least 10W.

10W for video playback is a lot. 5w average for light workloads is not unrealistic... I think your perception of power consumption is a number of years out of date at this point.

After all, Apple claims 18 hours from a 54watt-hour battery - you really think nobody else can get within 2x of that?