Too bad this was posted now, I used only Flying J Diesel except in Kansas last week & half (April 5th thru April 13th) and I didn't have any issue's except in Limon Colorado where the web site said they had ULSD, which they didn't, and the place was a dump and smaller than most service stations here in So Cal, they didn't even have overhead covers over their pumps. I used only Flying J because they had ULSD through out the trip except in Kansas were I found ULSD with no problem. The other truck stops were OK, but if I would have known your opinions, I would of made other arrangements due to the new 6. 7 CTD, I would not have chanced it. That being said I will see if my MPG is different using local Diesel, but was satisfied with the MPG on the trip overall.
Look at pics and more info on the thread I started in the C&C Forum, I still need too post more info when I know the numbers.