There is too much confusion here and it is common on this subject. CNG, LNG and LPG are NOT the same, or even close.

LPG (Propane and Butane) are easy, but the fuel is just as expensive as gasoline in many markets, much cheaper in some. It still comes from crude oil.

LNG is what is shipped in big tankers across the oceans, not what you can buy at the pump. It is hundreds of degrees below zero.

CNG is what T. Boone Pickens is pushing because he can make money off of it. Pickens Fuels owns a good percentage of the fueling stations. Conversions are more complicated because it is dispensed and stored at 3200-3600psi. The home compressor thing sounds attractive until you actually try to get the permits and run the numbers on lifetime costs.

I didnt PM you because Im not clear on which one you really meant.

"Oh, and in the US, natural gas == propane. In Mexico, you are likely to get butane. Different stuff, so be prepared. They do not interchange. It is the equivalent of gasoline vs. diesel fuel."

I think you have it a little mixed up. Propane and Butane are both liquid at room temperature and low pressure. LPG can be a mixture of both. Methane (Natural Gas) is still a gas at very high pressures and down to very low temps.

Jim