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Provides a brief overview of the energy cost per mile for a vehicle using gasoline versus the energy cost per mile using electricity in the United States. 

Reviews evidence on the environmental risks of growing lignocellulosic energy crops for biofuel production and policy ideas to address them.

Effectively enforced vehicle CO2 performance standards are at the core of any effort to realize lower-carbon transport. EU member states should implement supporting policy measures such as emissions-based vehicle taxes, mandates for electric vehicles, and emissions-based road pricing.


Addresses several common misconceptions about light-duty vehicle fuel efficiency and greenhouse gas standards and focuses on Australia’s proposed light-vehicle CO2 standards and the effects they may or may not have on Australian motorists.

Publication: Briefing

Provides a synthesis of information regarding the global development of hydrogen fueling infrastructure to power fuel cell vehicles. Compiles research on hydrogen infrastructure deployment, fuel pathways, and planning based on developments in the prominent fuel cell vehicle growth markets around the world.

Publication: Briefing

Analyzes the benefits of establishing separate engine CO2 standards in addition to full-vehicle regulations to specifically drive improvements in heavy-duty engine efficiency. Outlines a possible pathway for the development and implementation of separate engine CO2 standards for heavy-duty vehicles within the regulatory framework of the European Union.

Publication: Briefing

Reveals that the efforts made by multiple Transport Task Group (TTG) countries to promote and support policies and programs—including stringent tailpipe emissions standards, fuel economy standards, low sulfur fuels, and green freight programs—are in good alignment with the long-term perspective and pathways of the Transport Task Group defined in the G20 Energy Efficiency Leading Programme.

Publication: Briefing

Outlines the current procedure for the determination of fuel consumption, carbon dioxide (CO2) emissions, electric energy consumption, and electric range, specifically for PHEVs in Europe, highlights the most relevant changes expected with the introduction of the new Worldwide Harmonized Light Vehicles Test Procedure (WLTP) and discusses key differences between the EU and U.S. test procedures for PHEVs.

Publication: Briefing

Examines the link between soybean and rapeseed biodiesel and palm oil in light of a new study on substitution effects.

Publication: Briefing

Evaluates the European Commission’s version of the proposed EU new motor vehicle type-approval framework, where it relates to market surveillance activities, and proposes specific ways in which it could be strengthened.

Publication: Briefing

Highlights important innovations and trends in diesel engines and emission control systems, some of which were not considered when the 2025 CAFE and greenhouse gas standards were finalized, yet promise to improve diesel passenger vehicles’ cost-effectiveness, especially for larger classes.

Publication: Briefing

Summarizes the key barriers that impede the adoption of fuel-saving technologies in the trucking sector and discusses some of the ways policymakers can combat them.

Publication: Briefing

Summarizes and analyzes preliminary data for 2016 recently released by the European Environment Agency (EEA) on CO2 emissions from new passenger cars in the EU. New cars sold in the EU in 2015 had average CO2 emissions of 118 g CO2/km, which was 1.2% lower than in 2015.

Publication: Briefing