In depth discussion over 
here on the Escapees HDT forum.
One poster's comment:
I purchase on average 13,000 gallons of diesel every year as an owner operator running all 48 states and all of Canada. Been doing at least that for 35 years.  I have heard all the horror stories, but not only did it not happen to me, I cannot find any documented cases of biodiesel causing problems in our  fleet of 250 trucks(all owner-operators) in the last 10 years. There are lots of things that can go wrong in a fuel system, and blamed on biodiesel