2011
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1.8-Liter, 16-Valve, SOHC i-VTEC® Engine
The GX engine achieves 24 city/36 highway/28 combined mpg[1]. A host of sophisticated technologies include special engine mounts, crankshaft, engine block, pistons and connecting rods to help achieve remarkable smoothness.

[1] 24 city/36 hwy/28 combined gasoline equivalent mpg. Based on 2011 EPA mileage estimates. Use for comparison purposes only. Do not compare to models before 2008. Your actual mileage will vary depending on how you drive and maintain your vehicle.
Advanced Technology Partial Zero-Emission Vehicle (AT-PZEV)
To achieve Advanced Technology Partial Zero-Emission Vehicle (AT-PZEV)[1] status, a vehicle must meet Super-Ultra-Low-Emission Vehicle (SULEV)[2] tailpipe emission standards, carry a 15-year/150,000-mile warranty on emissions equipment, have zero evaporative emissions and include advanced technology components.

[1] AT-PZEV (Advanced Technology Partial Zero-Emission Vehicle) models as certified by California Air Resources Board (CARB) and states that have adopted California Zero-Emission Vehicle regulations.

[2] SULEV (Super-Ultra-Low-Emission Vehicle) rated by the California Air Resources Board (CARB).
Compact 5-Speed Automatic Transmission
This electronically controlled 5-speed automatic transmission offers quick acceleration and enhanced fuel economy[1]. You get more power, smoother upshifts and downshifts and quieter operation.

[1] 24 city/36 hwy/28 combined gasoline equivalent mpg. Based on 2011 EPA mileage estimates. Use for comparison purposes only. Do not compare to models before 2008. Your actual mileage will vary depending on how you drive and maintain your vehicle.
Compressed Natural Gas (CNG)
The compressed natural-gas (CNG) fuel tank is almost as impressive as the engine. The tank is lightweight, strong and built for safety. And for extra peace of mind, we've equipped the tank with an in-tank solenoid valve that will cut off the flow of gas if the system is compromised, or when the engine is turned off.
Drive-by-Wire™ Throttle System
The Drive-by-Wire™ throttle system helps enhance the driving character of the Civic GX. With smart electronics connecting the throttle pedal to the throttle butterfly valve in the intake manifold, the engine response can be optimized to suit the driving conditions and to better match the driver's expectations.