The Honda Civic GX is a passenger car factory-built to run on compressed natural gas (CNG). The GX is based on the Honda Civic and is available for fleet sales in all 50 states in the US. It is also available for retail sale in four U.S. markets, California, New York, Utah and Oklahoma. The GX is manufactured in Honda's Greensburg, Indiana plant together with the production of conventional Civics.
The Honda Civic GX first appeared in 1998 as a factory-modified Civic LX that had been designed to run exclusively on CNG (compressed natural gas). In 1998 the Civic GX cost $4500 more than a comparable Civic LX.