They did change up the rules for trucks in 2011 following the PT cruiser getting classified as a truck, but they made it worse.
Now CAFE standards are based on vehicle footprint, which encourages giant vehicles. It also killed the small truck category of vehicles, which is why a Ranger today is the size of an F-150 from before, and an F-150 is the size of a small moon.
On the plus size, it’s also why the base-model engine on the Maverick is the hybrid with the traditional engine being the “upgrade.”