http://www.fueleconomy.gov/feg/fe_test_schedules.shtml I sympathize with those not getting the mileage they expected. I mean, we buy a car based in part on the advertised mileage. But, the advertised mileage "is for comparison purposes only. Your mileage may vary." The blame should not fall on drivers ( except for horrible speeders and lead-foots), but with the EPA tests, especially highway. The MAX speed for the highway test is 60 mph. The average is about 48 mph! Link above. So, one can only realistically hope to get 47 mpg highway if one drives like that on the highway, which obviously is not a realistic way to drive on a freeway. So the fact that the Cmax does not get EPA advertised mileage on the highway is not actually surprising. But it is frustrating for the average consumer who thinks the EPA numbers should reflect the way people actually drive on the highway. Ford doesn't design the test, so it's not really anything they did wrong - just a poor system. I'm still waiting for my Energi to arrive, and although I would be thrilled to get the EPA numbers, I know that they are obtained under very different conditions than I drive my car, so I don't actually expect them. I totally agree with those who have made the point that grill covers should not be needed to improve mileage. If they are that useful to mileage, they should have been designed into the car. I have to wonder just how consistently they do improve mileage, given that such a simple device was not engineered into the car.