Which of the following statements about ULSD is NOT true?

The statement that is not true about Ultra-Low Sulfur Diesel (ULSD) is that high sulfur kerosene should be used in the blending of ULSD. ULSD is specifically designed to contain significantly lower levels of sulfur compared to traditional diesel fuels. The regulation that mandates ultra-low sulfur levels aims to reduce harmful emissions and improve air quality. Therefore, using high sulfur kerosene would contradict the very purpose of ULSD, which is to minimize sulfur content to 15 parts per million or less.

In contrast, the other statements regarding ULSD are accurate. A fleet may indeed experience slightly lower fuel economy because ULSD has different combustion characteristics compared to higher sulfur fuels. Additionally, the increased production cost of ULSD, estimated between 4 and 5 cents more per gallon, reflects the additional refining processes required to reduce sulfur content to ultra-low levels. Hence, stating that high sulfur kerosene should be used is incorrect.