Looking at page 14 of this link from Cummins.

http://www.everytime.cummins.com/***...Whitepaper.pdf

Is there anyone who after switching noticed any fuel effeciency benefits?

Also look at page 32 on the ULSD, if I missed it before we now have more proof that it sucks.

 

Oh yea, that had been explored a long time ago here. I was fortunate enough to have two (2) gas stations with lsd in my area readily available. You can check www.flyingj.com and see if any in your area. I also ran wvo for a while so did not worry too much.