More useful information on fuel efficiency, vehicle emissions and regulation may be found below.

The Outlook for Energy: A View to 2040
ExxonMobil, March 2013

Light Duty and Medium Duty Clean Diesel Vehicles: Global Market Analysis and Forecasts
Pike Research, June 2012

The Case for Technology Neutral Public Policy in the Fuel Economy Debate: Allowing Performance to Determine Solutions
Norman Y. Mineta, former U.S. Secretary of Transportation, and the U.S. Coalition for Advanced Diesel Cars, November 2011

Report on the First Quadrennial Technology Review
Department of Energy, September 2011

EPA and NHTSA Adopt First-Ever Program to Reduce Greenhouse Gas Emissions and Improve Fuel Efficiency of Medium- and Heavy-Duty Engines and Vehicles
Environmental Protection Agency (EPA) and National Highway Traffic Safety Administration (NHTSA), August 2011

Diesel: Fueling the Future in a Green Economy
Hart Energy Consulting, October 13, 2010

Interim Joint Technical Assessment Report: Light-Duty Vehicle Greenhouse Gas Emission Standards and Corporate Average Fuel Economy Standards for Model Years 2017-2025
Office of Transportation and Air Quality, U.S. Environmental Protection Agency; Office of International Policy, Fuel Economy, and Consumer Programs, National Highway Traffic Safety Administration; U.S. Department of Transportation; California Air Resources Board; California Environmental Protection Agency; September 2010

Technologies and Approaches to Reducing the Fuel Consumption of Medium- and Heavy-Duty Vehicles
Committee to Assess Fuel Economy Technologies for Medium- and Heavy-Duty Vehicles; National Research Council; Transportation Research Board, 2010

On the Road in 2035: Reducing Transportation’s Petroleum Consumption and GHG Emissions
Laboratory for Energy and the Environment, Massachusetts Institute of Technology, July 2008

Review of the 21st Century Truck Partnership
Committee to Review the 21st Century Truck Partnership, National Research Council, 2008