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For sulfur and particulates emissions, diesel and diesel engines did not meet sufficiently stringent environmental requirements here so several states (eight?) ban the sales of passenger cars with them. That may be changing now that ultra-low sulfur diesel (10 ppm sulfur max) is available and cleaner burning diesel engines are becoming available. U.S. refiners have optimized their conversion units to turn crude into the proper volumes of gasoline, diesel, jet fuel, etc. for U.S. consumers. If the relative proportions of those fuels need to change because there are more diesel cars, refiners will adapt accordingly.
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