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Analyzes the model structure, simulation flow, and limitations of the EU’s regulatory tool for the simulation of heavy-duty vehicle fuel consumption. Compares the regulatory vehicle simulation tools used in the EU and the United States.

Collects and analyzes real-world emissions data from multiple sources in China. The data include emissions of NOx, CO, and total hydrocarbons. from 55 LDVs and 67 HDVs tested using PEMS. The vehicle sample covers a wide range of emissions standards, from China 0 to China 5/V, and vehicle types. 

Finds that ILUC emissions from energy cropping are highly sensitive to assumptions of the composition of marginal lands and suggests that additional sustainability safeguards may be necessary for energy cropping in order to ensure that it only occurs on low-carbon stock land.


Compares dynamics of the most important driving cycles and their impacts on fuel consumption and CO2 emissions to produce an updated set of conversion factors for translating distance-based CO2 emissions among the different driving cycles.

Publication: White paper

First place is a three-way tie between Alaska, Spirit, and Frontier, but overall the fuel efficiency of U.S. domestic airlines showed no improvement in 2013. The slowing efficiency gains since 2010 highlight the need for policies to reduce aviation carbon emissions.

Publication: White paper

Introduces a novel methodology to monetize the benefit to consumers of electric vehicle incentives provided by U.S. states, and finds that more battery-electric vehicles are sold in states offering a greater total package of incentives.

Publication: White paper

Identifies six certification options, using Phase 1 and publicly expressed industry viewpoints as a guide, and evaluates them based on seven criteria developed to compare the certification procedures’ relative merits.

Publication: White paper

Assesses fuel consumption and fuel-efficiency technology adoption in China’s LCV market in 2010, focusing on differences among vehicle sub-categories and manufacturers, and compares fleet features and technologies in the U.S., EU, and China.

Publication: White paper

Documents the discrepancy between type-approval and real-world NOx emissions from new diesel passenger cars. On average, on-road NOx emissions from the vehicles tested for this analysis were about seven times higher than the limits set by the Euro 6 standard.

Publication: White paper

Extends an analysis of the gap between official and real-world fuel consumption and CO2 emissions for passenger cars in Europe, which reached 38% in 2013 and continues to grow at an accelerated pace.

Publication: White paper

Builds on recent research on the integration of trailers into HDV fuel consumption and GHG emissions regulations to conclude that the U.S. Phase 2 rule presents an opportunity to capture substantial and highly cost-effective efficiency gains from technology improvements.

Publication: White paper

Comparative analysis of interim progress reports from the industry teams participating in the SuperTruck program, showing all to be on schedule in reaching the program’s technology R&D and vehicle-efficiency goals.

Publication: White paper

Details differences in the fiscal policies used to support electric vehicle sales across eleven major auto markets. Tax exemptions and subsidies are playing a key role in spurring electric vehicle markets, but in widely divergent ways.

Publication: White paper