I talked to a guy that works for the gas company here as he was filling his company truck at the pump and ask him why they weren't running on CNG. He told me that the new Chevrolet's like he was driving were not available with a conversion to run CNG, but that the company was still running alot of the older trucks on CNG and he said it cost like $1.00 per gallon to fill with CNG. He also said they are a great and economical system when they work, but if you ever have to have one worked on it can be quite expensive.
