New to the Civic lineup, the Civic HF takes fuel efficiency to higher levels.
The Slippery Civic
The new Civic HF has the same smooth, mpg-enhancing shape as all Civics.
The Science of Fuel Saving
The Civic HF also gets the same efficient powerplant as the rest of the lineup, but adds an aerodynamic decklid spoiler and unique alloy wheels with low rolling-resistance tires.
To further enhance aerodynamics, the ride of the HF was lowered a bit compared to other Civic models, and special wind-cheating underbody panels were also added.
 Based on 2012 EPA mileage ratings. Use for comparison purposes only. Do not compare to models before 2008. Your mileage will vary depending on how you drive and maintain your vehicle.