A Yaris? Anything is capable of being compared but I don't think anyone smitten with a Smart will be getting a Yaris unless they have an urgent need and can't wait out their place in the queue.
I do think we are accustomed to going to the dealer and just buying a car like you would anything else. The build to suit model is appealing--particularly with the market moving towards personalizing a la Mini, Scion, and the C30.
Personally, I find we usually get the lower range figure due to mostly urban driving as well as "pushing it". I think it was (... er uh ...) wise of them to list both 2007 and 2008 ratings. It underscores how all ratings are going to take a hit. There just seems to be an upper range ceiling we can't bump past without adopting hybrid technology. I think people are hoping for a real break through but would also like to like their car. (This is the appeal of the Tesla Roadster.) I personally would find it hard to write the check for a Prius. If really pressed, the Civic GX seems more interesting to me.