There’s no question that the diesel-fuel market in the United States has undergone some significant changes in the past five years. One of the chief adjustments occurred in 2006 when the U.S. Environmental Protection Agency’s (EPA) new ultra-low-sulfur diesel (ULSD) standard went into effect. This regulation lowered the allowable sulfur content in on-road diesel fuel to 15 parts per million (ppm), which was much lower than the previous sta

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