CVT-equipped Civics earn EPA ratings if 30 mpg city/39 mpg highway/33 mpg combined. with the base five-speed manual, those numbers dip to 28/36/31. The HF runs low-rolling-resistance tires, aerodynamic aluminum wheels, underbody panels and a rear spoiler to achieve 31/41/35. The Si, with its 205-hp 2.4-liter four and six-speed manual, gets 22/32/25. The hybrid, 44/47/45.