2010 civic GX NGX (natural gas)

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Express your individuality with a sporty Civic that doesn’t require a drop of gasoline.

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.

http://automobiles.honda.com/civic-gx/