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ultra low sulfur diesel, has only 15 Parts Per Million sulfur content as compared to low sulfur diesel that was up to 500 PPM sulfur content, ulsd has become mandatory in 2007 and later vehicles by our wonderful EPA ;) thanks guys, we really appriciate it.............

on the other hand my truck hasn't been doing as well on fuel lately either but i think it may have to do with the fact of how long it takes to get to full operating temp in the semi-cold up here, and the winter blend fuel
 
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