Re-evaluated my old Excel chart I did years back to compare costs with my current mileage of 140k
Seems I would still come out ahead with the diesel (even if I didn't tow) with current resale values versus the 6.4L, but slightly over the 5.7L. Exact same spread as when I did it years ago with the 5.7L being the cheapest, the Cummins coming in within $500 more, and the 6.4L coming in last as the most expensive option especially if you use the recommended 89 octane. Everyone's situation may differ depending on costs and values in your area.
I would still think a diesel would be worth it even if my truck cost $2k more than the gaser version due to the added performance and ease of towing. That is not a lot of money to pay for the added value over the course of six years. I paid more than that for my Ecoboost engine in my F150 versus the base engine.
