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Comment to the Environmental Protection Agency
Proposed Rule to Revise Existing National GHG Emissions
Standards for Passenger Cars and Light Trucks
Through Model Year 2026
Document ID No. EPA-HQ-OAR-2021-0208-0116
Federal Register August 10, 2021, 86 FR 43276 FRL 8469-02-OAR
RIN 2060-AV13
Benjamin Zycher
Senior Fellow, American Enterprise Institute
September 27, 2021
Submitted through the Federal eRulemaking Portal at
htths://www~regu atins 1ovdocument/EPA- HO-OA R-2O21-0208-1 16
The Environmental Protection Agency Proposed Rule to Revise Existing National GHG
Emissions Standards for Passenger Cars and Light Trucks Through Model Year 2026 is fatally
flawed methodologically, and in particular cannot satisfy a standard benefit/cost test even
assuming the quantitative estimates provided in the Proposed Rule and the accompanying
Regulatory Impact Analysis. It does not provide a reliable guide for the estimation of the
magnitude of an assumed greenhouse gas externality in the passenger car and light truck sector,
and it does not and cannot provide a rigorous basis for an updated analysis in support of the
future promulgation of greenhouse gas policies generally. Accordingly, the Proposed Rule is
inappropriate; it must not be finalized in its current form, and any such finalization must reflect
a very substantial revision of the underlying analysis. Any such updated analysis based upon
the same or similar methodologies and assumptions similarly will be fatally flawed.
Summary
This comment letter to the Environmental Protection Agency (EPA) addresses the
Proposed Rule and the draft Regulatory Impact Analysis (RIA) on greenhouse gas (GHG)
emissions from passenger cars and light trucks through model year 2026, which by necessity
devolves into a regulation on fuel mileage standards. The arguments presented below can be
summarized as follows.
The American Enterprise Institute (AEI) is a nonpartisan, nonprofit, 501(c)(3) educational organization and does
not take institutional positions on any issues. The views expressed in this comment are those of the author.

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