Just a heads up that Honda has a new promotion where they are giving away a $3,000 pre-loaded card for use at any Clean Energy CNG station with the purchase of every Honda Civic GX Natural Gas powered vehicle.
At $27,000 MSRP (after destination), it's the priciest Civic in existence, but if you're in the market for something like this it's a great opportunity.
If you're in California it's especially good -- not only does CA have 40% of all CNG stations in the country, but you also qualify for HOV (carpool) lane access even when driving alone
Here is more information from Honda:
2012 Honda Civic Natural Gas - Incentives - Official Honda Website
I have owned a 2008 Civic GX before so if you have any questions about owning the vehicle I would be happy to answer them.