Living in the Northeast. I will run Howes lubricator this winter because it is an anti-gel. I will most likely run their meaner cleaner every few tanks in the summer. I drive my 6.7 out into PA every 2-3 weeks and tend to get a crappy tank of fuel when there. Last week I was getting 17.9 mpg until I filled up, then I got 13-15 on the highway. I was pissed!!!

 

I have read several posts indicating that no fuel additives are necessary for various reasons. Having just had $12K+ of repairs done to my 2012 F250SD, I would argue that point! As someone did point out, diesel fuel is "supposed" to have lubricants added at the refineries. Operative word, "supposed" to! And as pointed out, this is a crap shoot as to whether or not it is done, or done to the correct levels.
The issue here is that if the lubricant values are not correct, the High Pressure Pump WILL NOT be sufficiently lubricated, and as in our case, COME APART and send metal shaving throughout the fuel system, including the injectors which = NO BUENO!
Again, $12K+ in repairs, that included new injectors, rails, lines, filters, HPP, and the fuel tank removed and decontaminated. 9 days in the shop as they had to wait on parts.
So yes, to be on the safe side, I can say the fuel additives ARE REQUIRED. Of course Ford would only recommend Motorcraft products, etc , so do your research and use what you feel is best for your driving conditions!
Good Luck!