aerodynamicy doesn't have a whole heck of a lot to do with it till you hit ~70, then it starts dropping.
The reason the mileage sucks is because that tiny engine can't keep up with the big clunker it has to pull around. It's like the Isuzu Rodeo my girl had before we started dating. (She happily drives a Ford Bronco now) It was a 4 banger pullin an SUV. What genius thought that up? 4 cylinders, and it got 22mpg on an average day. Sometimes it was worse. Compared to my 351 getting 18? Cube for cube, do the math.
You want to talk gas mileage then..? Check out the focus, the fusion, the cobalt. Whatever suits your fancy.
I'm not completely anti-foreign car, but I don't like the reasons people buy them, because they're simply invalid. These cars are all comparable. And with this crazy rumor that hondas and toyotas 'last forever,' they're bringing down the american market. It totally blows.
Ryan