I agree. With fuel prices so low, mileage is not much of a decision factor.
I looked at buying a Tahoe, and at 25,000miles / year I believe it would have cost $50/mo more than a 33mpg car, not too significant.
Still, I know several VW Audi Mercedes people, and diesel has never been only about fuel mileage for us, just one of the reasons we buy diesel.

If you want a Mercedes diesel and find a new 2015 on a lot somewhere though, you should be able to get one heck of a deal.

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Gone to the dark side

- Jeff