So this brings up an interesting question. It has probably been asked and debated, but I'll try. Do the emission restrictions really lower the net pollutants? In other words, is it better to burn more fuel with less pollutants or less fuel with more pollutants. I wonder what the net pollution is for say 10K miles with new emission controls vs 10k miles without the new emission controls. I understand gallon for gallon there is less with new emission controls, but we should talk in miles. Anyway, interesting question that I don't have the answer to, lol.