This is what I was told by the people who should know.
It can be run on the front not inflated but will be destroyed in only a few miles.
Inflated, it can be run on the front for several hundred miles but at reduced speeds.
NEVER put the spare on the rear. It will turn the axle shafts at different speeds and will make short order of the guts in the ZF which would make for a very expensive flat tire.
My tire expert told me to be safe and just leave it at home.
Doug M