mixing and matching tires on a Quattro?

[Tessie McMillan]

The basic question is: do you ever mix tires on a Quattro, and by mix, I 
mean tires that are the same type, but different age or wear. And if not, 
why not? 

I bent my right front and rear wheels in an accident at the track, so I've 
purchased 2 new wheels. The left front and rear wheels and track tires are 
still in good shape; the tires only have 2 track events on them. These are 
directional tires, Yokohama A032R, hard compound, unshaved.

Should I buy 4 new tires and save the 2 old ones for spares, or can I buy 
2 new tires, mount them on the fronts, and de-mount/swap the old left 
front to be the right rear? Eventually I'd have to rotate that tire to 
the right front again, because the right front takes a real beating. 
Oooh. Maybe I just answered this question.

In any case, I'd appreciate your comments and collective wisdom.

Thank you!

Tess
in Bellevue, WA, USA