Automakers back Trump administration's rollback of US fuel economy rules

What happened

A group representing General Motors, Toyota, Volkswagen and other major automakers backed the Trump administration in a legal challenge to sharply lower fuel economy standards. The standards set a fleet-wide average of 34.9 miles per gallon by 2031, down from 50.4 miles per gallon approved under Joe Biden in 2024.

Confirmed

Global impact / market context

Looser fuel economy rules can let automakers sell more profitable gasoline models and spend less on electric vehicle development. The automaker group said uncertainty would endanger capital investment planning, which means the money set aside for future products, for hundreds of new vehicle models intended for the US market.

Analyst inference

California, New York and about two dozen other states, cities and counties sued over the lower standards, arguing the analysis ignored millions of electric vehicles. The legal fight creates a split between federal rules and state rules, which can raise costs for automakers that must plan products for both.

Analyst inference

What to watch

1. Watch the 1st US Circuit Court of Appeals, where automakers filed their support and where the states' challenge to the lower fuel economy standards will be decided. Confirmed
2. Watch whether the states ask the court to set aside the lower standards; automakers said that would affect business and endanger planning for hundreds of new vehicle models. Proposed
3. Watch automaker capital spending plans and product development for large gasoline vehicles, since looser rules can shift investment away from electric models and toward higher-profit trucks and SUVs. Analyst inference

Evidence

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