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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

Green Car Congress

Tackling road transport energy use is vital to enhancing energy security and reducing carbon dioxide emissions globally. Strategies to close this gap include better design of fuel economy test cycles, improved traffic flow and better road surface conditions. This gap can be up to 20% and must be reduced to minimize actual fuel use.

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US EPA and NHTSA Jointly Propose New Fuel Economy and Greenhouse Gas Regulations for Vehicles

Green Car Congress

Also, to the extent allowed by law, the agencies have harmonized many elements of program design, such as the form of the standard (the footprint-based attribute curves), and the definitions used for cars and trucks.