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Study finds that increased vehicle travel and decreased occupancy have undercut the impact of improving fuel economy over last 40 years

Green Car Congress

Sivak found that while the vehicle fuel economy of the entire light-duty fleet improved by 40% (from 13 mpg US to 21.6 l/100km), because of the decrease in vehicle load, the occupant fuel economy only improved by 17% (from 24.8 occupants carried) decreased by 27% (from 1.9 mpg US, or from 18.1 l/100km to 10.9

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IEA technology and policy reports outline paths to halving fuel used for combustion-engined road transport in less than 40 years

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IEA fuel economy readiness index status, 2010. New propulsion systems requiring new fuels, such as plug-in electric vehicle systems and fuel cell systems, are beyond the scope of this technology roadmap and are treated in separate roadmaps. Average fuel economy and new vehicles registrations, 2005 and 2008.

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Global Fuel Economy Initiative Releases Roadmap Report on Achieving 50% Fuel Economy Improvement in LDV Fleet by 2050

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The IEA and ITF have developed a range of projections of possible “business-as-usual” scenarios around this, indicating the potential for a doubling (or more) of vehicle kilometers travelled (VKT) combined with modest improvements in vehicle fuel economy. Vehicle taxes and incentives. Component standards, taxes and incentives.

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National Research Council Report Explores Improving Fuel Economy of Medium- and Heavy-Duty Vehicles; Recommends Immediately Beginning Developing a Regulatory Approach

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The National Research Council has released a prepublication edition of a new congressionally mandated report that evaluates various technologies and methods that could improve the fuel economy of medium- and heavy-duty vehicles (MHDVs), such as tractor-trailers, transit buses, and work trucks.

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MIT Energy Initiative report on transforming the US transportation system by 2050 to address climate challenges

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According to the report, “On the Road Toward 2050: Potential for Substantial Reductions in Light-Duty Vehicle Energy Use and Greenhouse Gas Emissions,” each element is separately important, but must collectively be pursued aggressively to achieve necessary emissions reductions.

MIT 150