Mixed tire sizes on Quattro

Ok, I know that side-to-side it is VERY bad to mix tire sizes. But, how doe sthe Quattro handle both fronts being %50 worn, while the rears are new? IE, how bad on the center dif is it?
Scott
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Not optimum but not not disastrous either. Engineers build a safety factor into the system. To put it another way, how often do people worry about their differentials based on whether they drive on too many winding roads?
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If the difference in circumference is less than 1-1/2 inches, then it's OK, provided the differnce is due to tire wear, and not because the tires are of different types.
Somewhere i read that Audi says that differential tire wear is OK -- even between a new tire and one worn down to the tread bars.
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