Is CNG the future? Yes, but…

Rinaldo Rinolfi, who is one of the fathers of the common-rail diesel, and a true powertrain guru, is someone I trust wholeheartedly when it comes to providing feedback on the future of vehicle propulsion. I recently asked the former Fiat engineer which powertrain he believes is the greenest, most affordable option available today. His rather surprising response was: compressed natural gas.