So, you see the 80's VW as a "tiny tinbox" . . .yet the Prius is . . what then?
I think that Chris' point still stands. --the Prius is an overly complicated tiny tin box.
If you want Prius beating economy, in something bigger, go for the BMW 520d.
http://www.technoride.com/2008/03/bmw_diesel_beats_prius_in_econ.php (keeping the pressure on

)