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US EPA/NHTSA propose GHG and CAFE standards for MY2017-2025 light-duty vehicles

17 November 2011

The US Environmental Protection Agency (EPA) and the Department of Transportation’s National Highway Traffic Safety Administration (NHTSA) jointly issued a proposed rule that would establish greenhouse gas (GHG) emission and corporate average fuel economy (CAFE) standards for model year (MY) 2017-2025 light-duty vehicles, extending and strengthening the program for MY 2012-2016 vehicles. The proposed standards are projected to require—on an average industry fleet wide basis—163 g/mile (101 g/km) of CO2 in MY 2025, which is equivalent to 54.5 mpg (4.32 L/100 km). The projected MY 2025 CAFE standard is 49.6 mpg (4.74 L/100 km).

The proposal introduces a set of fleet-wide average CO2 emission standards for cars and light trucks. These standards are based on CO2 emissions-footprint curves, where each vehicle has a different CO2 emissions compliance target depending on its footprint value—a parameter related to the size of the vehicle. Generally, the larger the vehicle footprint, the higher the corresponding vehicle CO2 emissions target. Manufacturers are not compelled to build vehicles of any particular size or type. Rather, each manufacturer will have its own fleet-wide standard that reflects the vehicles it chooses it produce. The following table shows the projected fleet-wide CO2 emission targets under the footprint-based approach.

Projected Fleet-Wide CO2 And Fuel Economy Compliance Levels
Vehicle Category & StandardModel Year
Passenger cars CO2, g/mi213202192182173165158151144
CAFE mpg40.041.443.044.746.648.851.053.556.0
Light trucks CO2, g/mi295285277270250237225214203
CAFE mpg29.430.030.631.233.334.936.638.540.3
Combined Cars & Trucks CO2, g/mi243232223213200190181172163
CAFE mpg35.336.437.538.840.942.945.047.349.6

The proposal also upholds the emission standards for CH4 and N2O already in place (0.030 g/mi and 0.010 g/mi, respectively). Manufacturers can (1) comply with these limits or (2) include their CH4 and N2O emissions, on an CO2-equivalent basis, in their fleet average CO2 calculation. Some changes are proposed for the calculations under the CO2-equivalent compliance option.

The proposal provides several compliance flexibilities for manufacturers:

Comments on the proposal will be accepted for 60 days from its date of publication in the Federal Register.

Source: US EPA