for heavy weights, sureRepairs on any modern car can be expensive. Gas engines are going direct injection, with injectors that won't be cheap , along with fuel pumps, etc. As to plastic parts, sure all cars are going that way. Anyone who relies in dealership service for repairs for any car risks expensive repairs. A transmission on any car is going to be expensive.. the marginal additional cost of diesel parts is insignificant when fuel cost savings are factored in.
Now I should point out that the commercial, heavy duty vehicle market where fuel and maintenance costs are calculated and vital to ability to make profit or go out of business.. that is dominated by Diesel engine powered vehicles. Make of that what you will, but it's a pretty good endorsement of diesel being economically viable as an engine choice in any vehicle..
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otherwise, not so much...see fords investment in big gas motors for vehicles