110-hp, 1.8-Liter, 16-Valve, SOHC i-VTEC® engine
The 110-hp, 1.8-liter, 16-valve, SOHC i-VTEC® in-line 4-cylinder engine uses engineering technology to produce impressive power, yet it still helps the Civic Natural Gas achieve excellent fuel efficiency and an Advanced Technology Partial Zero-Emission Vehicle (AT-PZEV) rating, all using clean-burning natural gas.
 27 city/38 hwy/31 combined miles per gallon mpg gasoline gallon equivalent (GGE) rating. 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.
 AT-PZEV (Advanced Technology Partial Zero-Emission Vehicle) models as certified by the California Air Resources Board (CARB) in California and states that have adopted California Zero-Emission Vehicle regulations.