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I would suggest a few things to achieve higher ratings. First is regap your spark plugs to 0.035". Second thing is inflate your tires to 40psi.(I know the ride might be a little out of your comfort zone on the road, but it helps a lot). I would run either a 91 octane fuel in your cruze or 87. 91 has shown to be the best solution. And lastly on my mind for now, is make sure your not getting brake lag. (Meaning your pads aren't sticking creating friction to the rotor causing them to try and slow down the car while your moving when you don't want it to stop yet). I had a LT before my eco and I could only achieve 38 or 39 mpg. And I did all these things I told you. Im sure what I told you will help. =]