Kidding aside, why is it that the diesel variant is not available on the US market? I might be wrong, but someone said that it isn't available.
For years, Mazda had been promising the SkyActiv-D for the North American market, as early as when the 3rd-gen was released here, in 2013. Time passed, and nothing. Then there was rumors that the diesel variant couldn't meet CARB standards, not unless it was severely underpowered and/or had poor fuel economy.
As of now, it's still expected for the 6, supposedly, along with AWD.
But at this point, why should they even bother? The diesel CX-5 that's soon-to-be-available has little, if any, fuel economy gain compared to the base 2.2L. It's horsepower is lower than the 2.2, and the all-almighty diesel torque (290 lbs-ft) is LOWER than the 2.5T which became an option on the CX-5 this year. It also needs urea to pass emissions (an added cost and inconvenience), and it's also a HUGE price jump, over $42K on a Signature! At that price, they'd better throw in the Vaseline for free...
Knowing that, it wouldn't surprise me that the 6 diesel will get maybe 1-2 MPG better than the base engine, still produce less torque than the 2.5T, still have the traditional diesel noise, smell, and horrendous cold-starting properties, and will send a 6 price above $38K!
To me the D doesn't stand for diesel, it stands for Dumbass, which is what I'd call the buyer/owner.