I know it effects me because when LSD (Low Sulfur Diesel) was in the pumps i got at lease 23 to 25 mpg that's with out additives but with additives i got at lease 2 mpg improvement. But when ULSD Rolls in Oct, i started to see my mpg drop to 19 to 22 that is without additives, if i added additives i got better mpg say around 21-24 mpg. I know there is no fuel leaks because i send my car to dealer for fuel leak inspection...

anyways what do you guys think.....

Ps
It was done on a 300SD....

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Current Garage
2008 Mercedes GL320 CDI 188k mi Repair/Work in progress
1994 S350 160k mi Garage Queen & prepping for repairs
2005 E320 CDI 203k mi Healthy & Daily Driver
1994 S350 357k mi Retried as parts car
1984 300TD 214k mi Blown OM617 Poss OM603 Swap??

Sold
1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
1999 S420 130K mi
1980 240D 360k mi
15+ Others that has come, stay and gone

GONE, BUT NOT FORGOTTEN
1995 E320 SE 220k mi
1984 300SD 350k mi