Nissan Leaf Burning up Electrons at High Speeds

I just read a post by Oliver Chalouhi, the first person in the country to take ownership of a production Nissan Leaf.  All is well, and he loves it.  It is quiet, peppy and the electronics are really sophisticated.

His only issue is that when he drives on the highway at 75mph, his range goes down to 60 miles from the published 100 mile range.  This makes sense, as air friction increases as the cube of velocity.  So, the faster the car drives, the far greater the mileage impact.

I keep on wondering then if pure electric vehicles are better suited for speeds under 60mph.  It actually sounds more efficient to have a gasoline or hybrid motor for fast highway conditions.  I know the Prius (45 mpg) is extremely efficient over a wide range of speeds, even clearly beating out the Chevy Volt (33 mpg) after the electric charge runs out.