The avergae MPG of cars driven by Americans continues to edge up. According to the EPA, average MPG hit 21 in 2008. It's up nearly 2 MPG since 2004.
High gas prices and then the cash for clunkers program are expected to keep the MPG moving up this year. CO2 emissions have also been fallling since 2004. That year marked a turnaround in the U.S. The EPA reports CO2 emissions increased and fuel efficiency decreased in the United States from 1987 to 2004.
Honda again leads in fuel efficiency on American highways, says the EPA. Next come Hyundai-Kia and then Toyota. VW finished fourth in fleet efficiency. Both GM and Ford showed fuel efficiency gains.