Miss those tasty gobs of smooth, unfettered torque from an American V-8? Thank the Corporate Average Fuel Economy mandate enacted by Congress in 1975. The law set minimum fuel economy standards for new cars beginning in 1978, before doubling them to 27.5 mpg by 1985. The law wasn’t enough to kill the V-8, which also survived the arrival of the 2007 Energy Independence and Security Act, which dictated automakers deliver a combined average fuel economy of 35 mpg for all cars and trucks by 2020.
This is a companion discussion topic for the original entry at https://www.hagerty.com/articles-videos/articles/2018/02/07/gm-pioneered-cylinder-deactivation