Most of you guys are living in some parralel world where people believe they need a 2.5 tonne car. Like JC says- most will use them for shopping and getting kids from school. As for 20+mpg being something worth talking about I suggest you look at the bigger picture. When will Yanks stop assuming they need something they can drive through a brick wall just to be 'safe' getting round town?
Get a Renault Megane DCi, VW Polo Blue Motion, Honda Civic CTDi etc etc and you're talking 60-70 mpg!
You're too soft as your government susidises the fuel. Try paying almost $10/gallon then you'll be looking for real fuel efficiency. Cars like this are a joke, its people who buy them that make me laugh though!