With tires, you get what you pay for I believe. Even buying a nice mid grade tire is well worth it over some cheap knockoff set. So much is riding on your tires ya know... :D
2-3 MPG overall loss FYI is what I've noticed, even with the EcoDiesel. I don't have a garage currently that I park my truck in so I have a lot of warm up time in the winter, I personally don't care about the fuel lost if I can get in a nice heated cab.
Welcome! A few members posted this link:
https://www.bamwholesaleparts.com/oem-parts/mopar-complete-engine-5158048af
I have no idea how that compares to a dealers price right now... other option is a used motor from a junk yard..