rear tire wear

[kras]

I had to replace my passenger side rear tire because it had a slice in the side wall. The tread left on both rear tires was about 6mm. The new tire had 10mm of tread. The dealer told me the difference in tread wear between the two, was out of spec by 1mm. So, the right thing to do would be to replace both rear tires. However, they only had one.

The dealer told me the the right side rear is the "drive" wheel. So all the torque goes to this wheel and the left gets whatever is leftover. Therefore, the right rear would wear faster, and the tire tread may come closer to spec.

I've never heard this before. Does this make sense?