It's hard to quantitatively measure the efficacy of a vacuum cleaner, it depends so much on the specific conditions. Seems a bit silly to mandate energy efficiency for something like that though. A typical vacuum cleaner probably gets run an hour or less a month. My vacuum could draw 20kW and while plugging it in and lugging around the power cord would be inconvenient, I doubt I'd notice the difference on my utility bill. I doubt I even run my upright vacuum that often even, I have a Roomba on each level that run on schedule and do a lot of the maintenance cleaning.