Interseting . . . They are proposing to cut Sulfur content for automobiles from 300 ppm to 30 ppm now at a cost of 10 billion dollars to 10 pm for another 10 billion dollars. . . while the standard for aircraft is still 3,000 ppm. . . Why is that???

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Charles T. Drevna, president of the American Fuel and Petrochemical Manufacturers, the refiners’ main trade association, said the companies had in the last few years cut the sulfur content by 90 percent, to 30 parts from 300 parts, at a cost of $10 billion in capital improvements. He said that the proposed cut would cost another $10 billion. Because the process consumes energy, it will raise the carbon dioxide output of refineries.

Gasoline in the other 49 states can now have up to 30 parts of sulfur per million, and the proposed rule will be 10."