If my wife gets 27 mpg with a 2005 Forester XS EPA-rated at 20/26 and 29 mpg with the 2012 Impreza EPA-rated at 27/36, what's wrong with this picture?
And I get 30.5 mpg with a 2007 Civic Si EPA-rated at 20/29 and 30.4 mpg with the Impreza.
In both cases, we're getting slightly more than the EPA hwy figure with our old cars and way below the EPA hwy figure with the Impreza. Same commute routes. Same drivers.