Having owned a number of small diesel cars, I fail to see any advantage to diesel power in small cars. The MPG numbers are impressive, no question. But the fuel cost per mile of a diesel car is, unfortunately, at best equal and often probably higher than competitive gas powered cars.
Locally, regular gas is as cheap as $2.20 and is everywhere for $2.29. Where as diesel is no lower than $2.79 and often over $3.00. Let's approximate that as 18% more. (2.30 v 2.80)
The Cruze D gets 42-43 in high speed highway use. The gas version (from experience, and I go fast, 34) . Sure you can skew those numbers by driving style, but that's a good place to start.
43 diesel mpg is equal in cost to 35 gas mpg. Using avg gas and cheap diesel costs. So, best case, a 1mpg cost savings.
But when you go to a Nissan Altima, clearly a bigger car, you get 36 MPG at 90 and 38 MPG at 80. Better, faster and bigger than the Diesel Cruze.