The production of crude oil and natural gas from unconventional reservoirs has become a growth sector within the North American energy industry, and current projections indicate that the production of some of these unconventional fossil fuels will continue accelerating in the foreseeable future....

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...