New EPA, DOE fuel regs give automakers longer to reduce CO2 emissions

Enlarge (credit: Aurich Lawson | Getty Images)

This week, the US Department of Energy and the Environmental Protection Agency have published new fuel efficiency rules that will go into effect in 2026. The rules favor both battery-electric vehicles and also plug-in hybrid EVs, but not to the degree as proposed by each agency last April.

Those would have required automakers to sell four times as many electric vehicles as they do now. This was met with a rare display of solidarity across the industry—automakers, workers, and dealers all called on the White House to slow its approach.

Under the 2023 proposals, the DOE would change the way that Corporate Average Fuel Economy regulations are calculated for model years 2027–2032 (which would take place from partway through calendar year 2026 until sometime in calendar year 2031), and the EPA would implement tougher vehicle emissions standards for light- and medium-duty vehicles for the same time period.