http://www.cars.com/go/advice/Story....bject=fuelList
Catch any car commercial these days, and you'll probably get an earful on gas mileage. It seems every automaker has turf to claim: GM's commercials assert good gas mileage as part of the company's ethos, while Honda ran a Super Bowl ad claiming it's the most fuel-efficient carmaker in America.
Unfortunately, there is no gold standard to rank gas mileage among automakers. The best-known effort — though it is not without its detractors — is the government's Corporate Average Fuel Economy program, established in 1975. Each year, the Environmental Protection Agency calculates CAFE based on gas mileage estimates for each car in an automaker's lineup and the number of those cars produced that year. . . .
This was one of the better write-ups about CAFE and it includes the current ranking, a nice read.
Bob Wilson