Originally Posted by JCL

Many purchasers of the diesel models were driven at least partly by the advertised improved fuel consumption over gasoline models. There are enough posts on here about the real world mileage of diesels to conclude that.

Opinion now. I think in many cases it is a feel-good thing, or part of a rationalization, rather than a calculated economic benefit, but a percentage of those purchasers (such as the OP) want to take it one step further and see if there is a financial benefit.