The Prius V is also taller than the standard Prius. I think it is about the size of the original Odyssey? The Sienna gets 18-22MPG, so the ~40MPG Prius V looks pretty good for a vehicle that is close in size.
This is being sold -- my local dealer has 'em. I have yet to see the iQ and the Prius C isn't due for a little while.