hi art
any of the truck/diesel forums will have massive digital piles on fuel additives. there are a few bits here too.
some additives alter gel point, others boost lubrication, others increase cetane rating, others clean stuff, some absorb water or segregate it, some are fungicides.....and so on.
i use stanadyne because charles on the powerstroke forums told me too
and because it boosts cetane (the most) and lubes and does all that other good stuff...
as i understand it ford is or will be selling the stanadyne under the ford label.
now comes the testimonials..........
so put your tall boots on.....
it also seems to boost my mgp from 1-2 mpg....so when i factor fuel cost + additive cost....it becomes economical....
for reference, i do not have deer sonar things or the air torando on my truck
i spent a few weeks and a few 1000 miles conducting my own trials with it before concluding it was useful...
cheers
2air'