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Comments on Test Procedures for Vehicle Emissions

The Environmental Protection Agency (EPA) proposed a rule adjusting the test procedures to calculate greenhouse gas emissions and fuel economy rates for the GHG and CAFE programs and the Fuel Economy and Environment Label upon adoption of Tier 3 certification test fuel. We submitted comments that encourage EPA to finalize the proposal, and explain that EPA would be required to provide a new proposal, rationale, and analysis if it chooses to forgo the GHG emissions test adustment.