Quote Originally Posted by sm1ke View Post
Ideally you would do as the manual says:

"Do not install the temporary spare tire on the front wheels (driving wheels): Driving with the temporary spare tire on one of the front driving wheels is dangerous. Handling will be affected. You could lose control of the vehicle, especially on ice or snow bound roads, and have an accident. Move a regular tire to the front wheel and install the temporary spare tire to the rear."

That said, I can appreciate wanting to get out of that situation quickly. In that case, having a spare that also fits on the front would have been ideal. I suspect that Mazda simply chose not to spend the extra money on a spare that accommodates the front brakes, and intends to fall back on the statement above when questioned.
In AWD all wheels are driving wheels.