Motortrend reported that the 8 gallons of DEF will last approximately 10,000 miles or one oil change. So depending on your driving you may have to refill your DEF tank about twice a year. I went wit the cost of MOPAR since that is what Chrysler recommends and it cost slightly over $20 per gallon. Of course you can go to to an auto-parts store and get 2.5 gallons of BlueDEF for $15 (for my zip code.) That will save you over $100 per fill up on the DEF tank. What quality or brand of DEF is a personnel choice and I priced the recommend stuff. But, if you go the auto-parts store route then its less than $60 per fillup. You will have some left over after each fill up and I don't know how long this stuff stays fresh after the seal has been broken and if the last 2 gallons will hold, then again you may get away with 7.5 gallons if you plan it right...
Whatever price is chosen based on brand of DEF should be included in the Diesel cost to operate. Again, you can't just put fuel in the car and expect it to run if you don't fill the DEF tank. You can skip the 30,000 mile Hemi spark plugs as the service schedule for 2014 calls for 100,000 miles and it is across the board V6 and Hemi. I don't know if or how often you have to replace glow-plugs in a Diesel. I have driven a Diesel but never owned one. As far as other fluids other vehicles all have to have oil changes, bug juice, coolant, ect. The DEF is the unique fluid to the Diesel and popped the cost per mile using local fuel rates in my area to just slightly more expensive to operate.
I don't know what the OP is trying to prove as once again he has used is own personnel hypermilage and not the rates the government has published. He gave the Hemi a 12% boost of 18MPG when the EPA clearly states the average MPG is 16. For the Diesel you have to believe Chrysler's numbers for now if you are going to make a judgement.
I was almost sold on the Diesel until I read the Motortrend report and started crunching numbers for what it was going to cost to outfit a Summit with the compression engine. Then I ran the MPG versus the cost per gallon and for the Diesel with DEF and soon discovered it would not only cost me more to purchase the Diesel, but I would never break even on the purchase due to the higher cost of Diesel versus 87 octane gasoline. In fact the cost of Diesel versus gas I broke even on the two vehicles, it was the DEF that made the Diesel more expensive to operate per mile.
I suggest everyone run their own numbers, and evaluate their drive habits and requirements.