The Environmental Protection Agency (EPA) and the National Highway Traffic Safety Administration (NHTSA) are proposing to weaken key fuel economy and greenhouse gas emissions standards for future vehicle models. In October, we highlighted our concerns with some of the economic analysis supporting the proposal. The Alliance of Automobile Manufacturers submitted comments that included economic analysis supporting the proposed rule prepared by NERA Economic Consulting and Trinity Consultants. In December, we wrote supplemental comments rebutting NERA and Trinity’s analysis, identifying serious flaws and unexplained departures from longstanding practices. NERA recently responded.
Our latest comments detail how NERA’s response does not address many of the problems we previously discussed. As our comments explain, the analysis relies on unreliable modeling and methodologies, for which NERA still has not provided critical details. NERA also misstates or fails to respond to our points on a number of topics, such as scrappage and fuel savings benefits. We point out the shortcomings in NERA’s response and provide more detail on each of the topics.