This is the best summary I could come up with:

Real-world fuel economy in model year 2022 rose slightly to 26 miles per gallon, according to the EPA’s latest Automotive Trends Report.

The National Highway Traffic Safety Administration (NHTSA) finalized that rule back in 2022, and earlier this year, it proposed even higher standards for cars made between 2027 and 2032.

Numbers for real-world fuel economy tend to be about 25 percent lower than official compliance data might show, according to Dan Becker, director of the Safe Climate Transport Campaign at the Center for Biological Diversity.

Average fuel economy for Ford, General Motors, and Jeep and Dodge parent company Stellantis last year ranged between about 21mpg and 23mpg.

Supersized passenger vehicles burn through more gas than smaller cars, which also means that they create more tailpipe pollution that worsens air quality and causes climate change.

Fortunately, the emission rate for planet-heating carbon dioxide from new vehicles still dropped 3 percent to a record low last year, the EPA reports.

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