Some of you might find this interesting:

"Building the first production cars with dual-mode natural gas drive in 1994, the BMW Group once again paved the way for mobility compatible with the environment, the BMW 316g and 518g being able to run on both natural gas and gasoline. Natural gas drive generates far less carbon dioxide harmful to the earth's climate than engines running exclusively on gasoline or diesel alone."

LNG-powered cars are far more economical than our gas guzzlers - maybe all of us will drive on natural gas soon!