Can toe-in for the back tires be adjusted on the A6
 

Or only the camber. I just bought new tires and I want to make sure the front and rear alignment is correct. Looks like I might have some funny ware on the back tires, or th etire could just be junk....

AFAIK both the rear wheel toe and camber are adustable.

Toe is set by the eccentric bolt at the inboard end of the tie rod which bolts to the rear subframe right above the inboard rear lower control arm bushing.

Camber is set via the eccentric bolt at the outboard end of the lower control arm which bolts to the bottom of the rear wheel hub.

Hmmmmm, not seeing what you mean , any pictures any where??
I get the camber, don't see the toe in. is it like the A4 wituh the rear control arm?? I didn't see one last time I was under there?? I thought is was fixed toe in . maybe that's why I burn up tires so fast.

monkeytronic is correct. Toe is adjustable. Look from the rear and follow the tie rods up to the point where they attach to the subframe. That's your adjustment point.