I was having the same issue out here in s.l.c. utah. I called several local diesel shops that are reputable throughout the diesel industry and they all told me "to get used to it due to the ULSD" and that some stage 1 or 2 injectors would help some but not solve the problem. Definately not what i wanted to here, but not willing to get rid of my new hobbie over the deal. Try some different fuel stations it did help me a little, about 1-2 mpg better.