Here's the one pertinent paragraph from the article:

The rules will break the light truck segment into six different categories based on weight and vehicle type, with the smallest vehicles forced to get better mileage than larger ones. The current rules consider the fuel economy of the entire fleet as a whole.

Congratulations! Now we have the "Fuel Efficient Truck" initiative, to join The "Healthy Forests" initiative, and the "Clear Skies" initiative...

CAFE just got eviscerated again.

Now you've removed all incentive to build anything but the biggest behemoths on the road, and 80% or more that I see are carrying a driver alone, and no cargo. But, hey - "look at me in my new F-you Mobile..."

Schadenfreude...