The article "The mpg gap" Consumer Reports, August 2013, attempts to address why "Some window stickers promise too much." For people as anal about mileage as Prius owners, this article left out a lot to editorialize about their still, undocumented mileage test. I have no problem with their highway mileage testing, 65 mph constant speed on a local highway, as it is clearly documented.
To repeat the Consumer Reports mileage test, this is what they say:
Source: Consumer Reports, August 2013, pp. 51
In contrast, the EPA and European tests are well defined in both distance, acceleration profile and speed:
For those who don't know, the Leaf and i-Miev are currently the only two US cars that are compatible w/CHAdeMO, of which there are over 2703 of these chargers in the world per
CHAdeMO Association. It can charge a Leaf from 0 to 80% in ~30 minutes.