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Lamont and Connecticut environmental officials criticize federal rollback of fuel economy standards

Gov. Ned Lamont and the state's acting environmental commissioner said the federal rule, which lowers a planned 2031 mileage target from 50.4 to 34.9 mpg, will raise fuel costs and worsen air pollution in Connecticut.

Connecticut Gov. Ned Lamont and the state's top environmental official on Monday criticized a final federal rule that rolls back fuel economy standards for passenger cars and pickup trucks, saying it will cost drivers more at the pump and worsen air quality in the state.

According to the governor's office, the rule from the National Highway Traffic Safety Administration lowers the corporate average fuel economy standard, known as CAFE, from a previously set target of 50.4 miles per gallon by 2031 to 34.9 mpg. The standards require automakers to meet a minimum average mileage across the new cars and light trucks they sell.

"Federal fuel economy standards have received bipartisan support for more than 50 years because they save everyone money at the pump and we breathe cleaner air as a result," Lamont said in a statement. He said the state would continue to offer programs that help residents buy cleaner, more efficient vehicles.

Emma Cimino, acting commissioner of the Connecticut Department of Energy and Environmental Protection, said the weakened standards had been projected to save Americans about $82 billion in fuel and that over the past 10 years they saved the average household $630 to $840 a year.

The governor's office said the federal agency's own analysis shows the rule will raise fuel costs by $1,600 per vehicle, add more than $345 billion in costs through 2050, eliminate more than 10,000 jobs by model year 2031 and increase fuel consumption by 121 billion gallons.

State officials said cars and trucks account for almost 70% of smog-forming emissions in Connecticut, which has more than 2.7 million registered vehicles. The state exceeded federal ozone standards on 23 days in 2024, 22 days in 2025 and 17 days so far in 2026, according to the governor's office.

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