The average fuel economy of passenger vehicles in the United States was 21 mpg in 2006, the EPA announced this week. In 1987 it was 22.1 mpg, and in 1997 it was 20.9. Average weight now stands at an all-time-high of 4142 pounds — more than the typical 4060 in 1975, when most vehicles averaged 13.1 mpg.
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