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I have an AWD impreza, so I would put the spare on the front, because it is an open differential. The recommendation for fifty miles is to keep the diff from burning up. Most of the time, the car is going straight, so the diff is not under undue stress. When my Acura had to wear a donut for a week, I rotated it to the rear and let my wife drive it, because her commute is only a couple of miles each way.
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