The "cash for clunkers" program might be a boon for car dealers, but for American automakers the news isn't so good—four of the five top-selling cars in the program are Japanese. While the Ford Focus is the No. 1 seller, Toyota and Honda occupy the next four spots. The new vehicles get an average of 25.4 miles per gallon, while the traded-in cars—more than 80% of which were trucks and SUVs—get just 15.8 mpg.
(Read more Cash for Clunkers stories.)