The Civic HF is a fuel-efficient variant of the 9th-generation Civic designed for better gas mileage. Here are some lesser-known facts about it: AERODYNAMIC ENHANCEMENTS: It features subtle aero tweaks such as a unique front grille underbody covers and a rear decklid spoiler to reduce drag and improve fuel efficiency. LIGHTWEIGHT WHEELS & LOW ROLLING RESISTANCE TIRES: It comes with 15-inch alloy wheels that are lighter than the standard Civic wheels paired with special low rolling resistance tires to maximize fuel economy. HIGHER FUEL ECONOMY THAN THE BASE MODEL: While the standard 2012 Civic Sedan with an automatic transmission gets around 28 MPG city/39 MPG highway the HF is rated at 29 MPG city/41 MPG highway due to its efficiency-focused upgrades. NO MANUAL TRANSMISSION OPTION: Unlike other Civic trims the HF was only available with a 5-speed automatic transmission as it was tuned for efficiency rather than sporty performance. SAME ENGINE AS THE BASE MODEL LOWER RIDE HEIGHT: The suspension is slightly adjusted compared to the base model lowering the HF slightly for better aerodynamics. RARE COMPARED TO OTHER TRIMS: The Civic HF was a niche trim level and didn't sell as widely as the CIVIC LX EX or Si models making it somewhat rare today. BRIDGES THE GAP BETWEEN STANDARD AND HYBRID: It was positioned between the regular Civic and the Civic Hybrid offering better mileage than a standard Civic without the complexity or cost of a hybrid system. DISCONTINUED QUICKLY: The HF trim was only available for a couple of years (2012-2-15) before Honda discontinued it due to increased efficiency in the base models and the growing popularity of hybrid options.