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I was curious so I checked mine out...it is a Hankook Optimo H426 which is a regular service four season tire, NOT a flimsy emergency only donut type...kudos to Ford for supplying a real tire that is the correct diameter and only 20mm narrower than the cars tires.

I think I know why they did this. If you put a compact spare on the front that was shorter, the torque vectoring system would go crazy and fry your brakes. But as you said, kudos to Ford since other companies are just leaving out the spare tire completely.