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Our readers are passionate about what type of energy will power the world's vehicles in the future. You have your electric car camp, your hydrogen camp, the gasoline traditionalists and also natural gas supporters like T. Boone Pickens, who believes the U.S. sits atop so much natural gas by divine intervention. Depending on what camp you presently reside in, two new studies on natural gas emissions may fuel your passion or weaken your resolve.

Chrysler intends to launch compressed natural gas- (CNG-) fueled vehicles by 2017, according to Bob Lee, the automaker's vice president for engine and electrified propulsion system. At the 2011 SAE World Congress, Lee told journalists that CNG "technology is very actively being worked on" and added that "it's a good way for some diversity in the market in terms of fuel use."

Maruti Suzuki, India's largest automaker, has unveiled a lineup of CNG-powered vehicles that run the gamut from entry-level compacts to sedans and right on up to MPVs. The company's factory-fitted CNG engine technology, dubbed "intelligent-Gas Port Injection" (i-GPI), will be immediately available on five popular models, including the SX4, Eeco, Wagon R, Estilo and Alto. According to Maruti Suzuki: