That's not entirely true. The most common 1500 or 150 sized "half-ton" trucks are included in CAFE and do affect the fleet fuel economy rules. It is the heavi

That's not entirely true. The most common 1500 or 150 sized "half-ton" trucks are included in CAFE and do affect the fleet fuel economy rules. It is the heavier 3500 or 350 and up "1 ton" trucks that are considered commercial and not included in the CAFE fleet fuel economy requirements. If you can take 1 MPG off the fuel economy rating of a half-ton truck, the auto manufacturers are all ears and ready to buy if you can prove it on the drive cycle. They are motivated to optimize the trucks where they can, while still having a salable product. But the desire for larger, taller vehicles in North America wasn't all about fuel economy relaxation either. The minivan replaced the sedan and station wagons as family cars in the 80's, and cross over SUVs replaced minivans in the 00's. Even small cars of the 90's like Camarys and Civics ended up bigger and taller in the 00's.