There is growing evidence globally and in China of the gap between laboratory test findings and real-world carbon dioxide (CO2) emissions and fuel consumption. Building on previous work, this project...
Published 2018.06.21: Publication
As policymakers in India deliberate on how best to design a regulation to improve the efficiency of new heavy-duty vehicles (HDVs), one of the most critical issues is what test methods and duty...
Published 2015.11.09: Publication
We've just released the annual update to our From Laboratory to Road series, which documents the growing gap between official, or type-approval, CO2 emissions from passenger cars in Europe and their...An explanation of what has and has not caused the gap between test-lab and real-world vehicle CO2 emissions to increase by over 30 percentage points in just over a decade.
Published 2015.09.30: Blog Post
Improving the conversions between the various passenger vehicle fuel economy/CO2 emission standards around the world
Most governments of countries (or, in the case of the European Union, regions) with large auto markets regulate passenger vehicle fuel efficiency or CO2 emissions (essentially the same thing, since...We've updated our comparison of passenger vehicle fuel-efficiency standards worldwide, improving the test cycle conversion factors used to translate the standard values among the different...
Published 2014.12.03: Blog Post
Development of test cycle conversion factors among worldwide light-duty vehicle CO2 emission standards
Comparing the light-duty vehicle fuel efficiency standards in effect in the world's largest auto markets is not a simple, straightforward process, because any fair, apples-to-apples comparison must...
Published 2014.12.03: Publication
The recent spate of news on Ford lowering the mileage rating on its C-Max hybrid (e.g., here and here and here) could lead some to question the in-use fuel economy benefits of hybrids. That would be...The recent spate of news on Ford lowering the mileage rating on its C-Max hybrid could lead some to question the in-use fuel economy benefits of hybrids. That would be a mistake.
Published 2013.08.16: Blog Post
Discrepancies between type-approval and real-world fuel consumption and CO2 values in 2001-2011 European passenger cars
In order to limit the negative effects of climate change and to reduce dependency on oil imports, the European Union (EU) needs to reduce its GHG emissions by 80-95% below 1990 levels by 2050. A...
Published 2012.04.04: Publication