2020 ecodiesel here w/ 33 gallon tank & 3.92 gears, 8 months old and 21k miles
came from a 15' gmc 5.3 and i wouldn't go back to gas
diesel pros:
- better low end torque which is nice for pulling trailer, especially up hills
- better mieage, i average 23ish mpg but im also a pretty aggressive drive, if i cruise at 65 i get 29mpg
- amazing range, 700+ mile range is freaking awesome, i only fill up once a week now.
cons:
- has a pretty significant lag off the line, but i got used to it
- diesel is usually a bit more expensive
- DEF which i use about 1 gallon/1000 miles
- oil change at the dealer: $180 in southern california (about $80 if you do it yourself)
- fuel filter change at the dealer: $390 in southern california ($37 if you do it yourself, its the same filter at the cummins)
- long term repairs are usually more expensive on a diesel
so basically i wouldn't get one to save money, i pretty much just got it for the torque and the range.