Just read the following article that highlights the new federal requirements for new vehicles sold in the United States and it states that they "will have to travel an average of AT LEAST 40 miles per gallon" in 2026. This is going into effect to eventually save people a measly $1400 in gas during the LIFETIME of a 2029 model year vehicle. Of course, this is assuming gas prices stay the same.

www.autoblog.com
And no, I don't think this is an April Fools

New vehicles must average 40 mpg by 2026, up from 24 mpg - Autoblog
DETROIT — New vehicles sold in the United States will have to travel an average of at least 40 miles per gallon of gasoline in 2026 under new rules unveiled

And no, I don't think this is an April Fools