Corporate Average Fuel Economy.

The feds keep raising the target on how fuel efficient cars have to be, so manufacturers come up with stupid gimmicks like engine start-stop, cylinder deactivation, 3-cylinder engines with turbochargers, etc. All just to squeeze some extra miles-per-gallon in a lab.

Meanwhile, in the real world, you're stuck with an anemic piece of shit that has a heart attack just trying to merge onto the highway while burning more gas than if you had a regular V6.