The small diesels get superior fuel mileage, just as the large diesels do, in their respective categories relative to comparable gasoline vehicles. It's no surprise, given the relative energy content per gallon of the two types of fuel.
The question is, what are the comparative overall, long-term economies, especially after the warranties are gone? These economic factors include not only the comparative cost of fuel and engine fuel-usage rates, but also all the other costs involved in running the machines.
I think the issue is yet to be determined over the long term, given the complexity of environmental rules and the design of diesel engines needed to meet them.
Otherwise, only fools would buy gasoline vehicles if the diesel option proves to be reliable and pays for itself 1.5 years and the owner is ahead by 30 grand over a dozen years at a usage rate of 20 thou miles annually. By the way, that would be remarkable!
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