It does appear that dumb. CAFE seems predicated on exceeding a particular average gas mileage for each class of vehicles. If I understand it correctly, having

It does appear that dumb. CAFE seems predicated on exceeding a particular average gas mileage for each class of vehicles. If I understand it correctly, having a small truck counted among your sedans hurts the average MPG of your "car" line since even a fuel-efficient truck performs worse than cars. Solution: add just enough mass to the Frontier to bump it from "cars" and put it in the "truck" class. Among "trucks," the dummy-thicc Frontier now becomes the best-performing Truck, whose high average MPG raises the shittier average MPG of the rest of your gas-guzzling Titan/equivalents. Then you don't need to improve any of your existing trucks. ...which leaves little incentive for anybody to make a small truck. It hurts your average car MPG and only qualifies as a Truck if you add so much weight to it that it's no longer "small." This is dumb.