I have run a B20 before, did not notice much other than it smelled cool. [laugh] [laugh] But Cummins says, no more than B5, the crazy Furd people told me on my service truck(2006 by the way) they would not recommend it at all?? What's with that? Maybe it's just because it's a 6 oooohhhh-nooooo!!

What are they worried about? Just trying to make a well informed decision, actually gonna pick up some B20 tomorrow I think. I know when I ran the B20 it was in the winter time, 20's or so and I did notice my fuel pressure was down a bit from normal, filter has been changed since. I also have that crappy.....I mean wonderful in tank conversion that Dodge came up with, any ill effects there?

Cummins has recently approved up tp B20. The Ford guys are full of BS.(for a Cummins)

The reason they don't tell you it's okay to use it is because most home brewed bio diesel hasn't had the battery of testing that mainstream production diesel has had.
They can't control how the vehicle will react to fuel that is widely untested.
Even regionally produced bio fuel may not be tested the same, and meet the same standards from region to region.
Just my .02