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BRZyJ: Rationale being - on cars with limited slip diff on drive axle (including ours) different diameter wheels/tires will mean LSD working all the time, even when driving in straight line, to compensate different rotational speeds. Result = overheat / heavy wear, possibly even killing diff in not that long distances. Thus both in manual for ours (and for other cars with LSD, eg. FWD ones, but of course, regarding front axle then) it's mentioned to put different wheel (such as space saver) on dead axle, and move wheel from it to drive axle, if punctured tire happens to be there.
Actually if wheel and tire is of same size for full size spare, difference might not be that big, thus i might be overthinking things too much. I don't happen to have clear data of how big difference is "too big", and "how long one can drive in emergencies", so maybe being too cautious, wishing for everything in car to last longer. But f i have time, if it's not emergency, i'd probably try to put as similar as possible tires on drive axle. Full size spare one can be of different wear, different make, maybe even of different size (eg. - stock primacy, when you changed rest to some wider other tires) or underinflated by years unused, due forgetting to check it's pressures too). Front ones most probably will be more similar ones to punctured one. And it almost doesn't matter to have different sized wheels on dead axle or on car with driven axle with open diff (open = little to no friction / less heat generated), so even different wheels/tires can be safely be used there for long distances/several days.
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