I rotated the tires this morning. The rear tire depth was a hair above 7/32nd and the front tire depth was just under 9/32nd (not quite to 8/32nd) at 5100 miles. These tires at new come as 9/32nd per the specs at Tire Rack.
|Rear tires wear out much quicker even on an AWD|
So the rear tires seem to wear out at approximately 1.5/32nd in 5000 miles and the front at 0.5/32nd in the same periods, or 3x faster in the rear. Since these tires are rated 400AA and should last ~40,000 miles when they reach 2/32nd and I seriously find that is going to be impossible to achieve.
They key for longevity is both correct pressure and frequent rotations.