In general, a diesel has the potental to be cost effective under certain circumstances.
If you are a 50k plus miles annually operator, meaning minimum short hauls, predominate highway driving, not unlike a road going tractor, the operating costs can be less......that and operate in a climate that allows the sheet metal to not revert back to iron ore in less than ten years......however:
The potental is lost when ancillary failures come into the mix.
Short hauls introduce the possibility of the starter or alternator failing at a similar mileage to a gasser.
These components, due to their larger size and capabilities, are, on average, often double the price of the lighter duty gasser components.
A diesel introduces another component into the mix: glow plugs.
Again, short haul trips will shorten their lifespan.....the long haul croud will have rare failures due to less glow plug cycling.
Because of low emission requirements, the diesel now must have as much electrical gobblygook as a gasser so there is no gain in simplicity that diesels enjoyed years ago, so the thoughts of reduced electrical failures is essentially null.
The same battery failure rate as a gasser is probable and the higher ampherage battery a diesel requires is more expensive than a comparable gasser.
There are other examples......the particulate catcher may require replacement sooner than anticipated on the short haulers too.....a result of not being hot enouph, long enouph.
If I was the type that puts 50k a year on a car, with the intention of running it till the wheels fall off, and stick them back on for another year or two, a diesel would be my choice.
But, I'm a short hauler.....the trip to and from Lordstown last week was the longest my car has run since taking deliver two years ago......14k miles in two years.
Add to that, I get bored.....very rare for me to keep a car much past three years......I have been known to buy the same exact car simply because I liked it, but needed to see a new color or wanted different options.
I'm not alone.....and those who, like me, drive short, get bored, etc. a diesel won't work.....the next owner gets the benifit.
Anyways, to finish off, I part time for my son, repairing his equipment for his demolition company.
Until about two years ago he had his four jobsite supervisors in diesel pickups.....under the guise of lower costs.
Because the vehicles are predominatly short haulers, the maintenance was rather expensive as noted above, and, being in Northern Illinois, rust was a continual battle......mud plus salt is a evil evil mix.
We are now in mid conversion to gassers with the intent of rotating out every three years......already our service expense is falling.....fast.....
So, big miles, short time, diesel all the way.....short miles, long time, go gas if cost control is the plan.
Now, if you just dig diesels.....rock on....daym the expense and have fun with it.....thats what it's really about with cars...enjoyment IMO.
Rob