Ive been researching the topic at hand, and most manufacturers recommend removing a good full size tire from the back and putting it up front if you get a flat on any of the front tires. Subaru even makes you put a special fuse in to disable the AWD system. I read that some Chrysler vehicle computers have an algorithm that can sense when the donut spare is installed and it disables the AWD system so nothing gets damaged. My question, does anyone know for certain whether most modern cars will do this by disabling the AWD system when the donut spare is installed? Specifically Mazda? Thanks!