Its factory everywhere but the United States. The problem with all of these "diesel news" postings with high mpg numbers are that they are, as indicated, imperial mpg which is different and they are not federalized for the US. That is a lot of money and it is not worth it for just one car, like a Cruze for example. The gas powered Cruze will do 42 mpg highway and about 30 city and will do it with a cheaper sticker price and cost of ownership than a diesel version of the same car. When you add the diesel motor premium and the increased cost of fuel (diesel being over ten cents more than regular), the increase in mileage isnt that good and isnt worth the increase in the sticker. I dont see Chevrolet going through the trouble of federalizing a diesel motor for their economy car that will drive the sticker price WAY over its competitors? So, add federalization costs (that will be added to the price of every car), diesel motor premium and increased cost of fuel to the cost and youve got a car that is much, much higher than its competitors. I know VAG and Merc are doing it but they have a diesel motor that can go in more than one model so federalization is worth it to them.
Keep dreaming guys. If you want a diesel, youre going to have to build it (and its going to have to be something pre 95 to get around the EPA regs). Jeep gave it a shot and couldnt move enough units to make it worth it. Merc and VAG do it and are successful (relatively) because their average customer is willing to spend that money. Also, look at VAG, their offering a hybrid now. Its more expensive and loses 4 mpg to the TDI but the performance is much better. So much so that the car rags are recommending the hybrid over the diesel version, even though they acknowledge that the TDI gets better mileage.
Im a diesel owner and love it. My 6000+ lbs piece never gets below 17 around town. VW has about 2000 Amaroks sitting at the port in Baltimore brought in by VWoA. No destination on the manifest. For those that dont know, the Amarok is only available in diesel trim.