It's all about the load being applied to the rear tires. The engine applies all the force to the rear tires when going in a straight line. The force is then transferred through the tire to the road. More force = more tire wear. I have had a number of rwd cars and the all have worn faster in the rear. My front wheel drive cars have worn more in the front. Unless you are turning under serious load on a regular basis (track, hard mountain driving, etc) I would have your alignment checked.
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