Who cares, I hate all new diesels that have to be smoged. All the smog garbage seems to kill mileage. I bet most of our trucks, or even my wife's '03 PSD with no smog on it burn cleaner per mile, maybe not ppm. And the smog tests I've had to do with our PSD are a joke, look under hood and at exhaust, the. Look in mirror as they rev the engine to see if it smokes. A bunch of BS!!