Kranz says cars like the Ford Five Hundred (Taurus), seen above, and the Dodga Caliber, hint at the body styles we're likely to see more of as automakers change cars to meet the rules. The reason is that different model classifications might have different fuel economy targets. If the rules are decided by where the wheels hit the road, for example, then you can gain space by making the car taller instead of wider or longer where you'd bump into the next mpg category.
The whole article is worth reading (if you've got a subscription). How would taller, slightly smaller cars fit into your lifestyle?
[Source: Automotive News]