Basically, Ford says minimize your extended idle time, and get the best quality diesel that you can; the higher the cetane the better.
I use 8oz bottles from Stanadyne with about 4oz of their Performance Formula, 2oz of their lubricity additive, and 2oz of Amsoil's Cetane Boost, per full tank. Have been doing that on late model VW TDI's and BMW diesels for years. I usually order my additives in bulk over the internet and split them with my Dad who has a couple of diesels. Do what you want with whichever product that you want, I'm not selling anything or trying to convince anybody to do anything; this is just what I do and I believe it works.
Don't forget to use the white funnel in the spare tire kit if you try and pour any additives in on our cap-less tank on the Jeep - it won't go down unless you do, and will just spit out the drain under the vehicle if you don't.
AMSOIL Diesel Cetane Boost