The Detroit News has the sad facts here.  Detroit is still behind on mileage.  As they point out

Honda has the most fuel efficient fleet in the U.S. for 2009, with a fleet-wide average of 23.6 mpg. Hyundai is in second place, with 23.4 mpg, edging out Toyota, which used to be in first place, by a slim margin, at 23.2 mpg

And what about Detroit? At the bottom of the list. Ford was in seventh with a 20.5 mpg, even though sales of Ford Fusion, Ford Fusion Hybrid and new Ford Taurus are through the roof. General Motors was in eighth at 19.9 mpg; and Chrysler was last at 18.7 mpg