We recently discussed the benefits and challenges of running a car on natural gas. If that inspired you to think about making the switch, you probably pretty quickly narrowed down your choices down to the Honda Civic GX and, well, that's it for fresh-from-the-factory major automakers. Converted vehicles are the other option. Honda has begun producing the GX at its plant in Greensburg, Indiana, where it also makes the 4-cylinder Civic sedan. Before the move, Honda made about 1,000 copies of the GX each year in Ohio.
The United States EPA rates the Civic GX as the cleanest car available in America. Last year, during the gas price spike, the GX was very hard to get.
[Source: Green Car Congress]