The shale gas revolution in the United States has dropped the price of natural gas (NG) significantly. Combined with new fuel and vehicle technologies, an opportunity exists to expand the use of NG throughout the economy, including in the light-duty fleet of cars and trucks. This expansion could...

In September 2011, the National Highway Traffic Safety Administration and U.S. Environmental Protection Agency promulgated the first-ever federal regulations mandating fuel economy improvements for heavy-duty commercial vehicles. While the performance-based approach to these rules offers...