If the tires are wearing fine and are properly inflated it probably is the crown. You can check that by driving in the fast land on the freeway. Usually crowns to the left.I bought the car at a Hyundai dealership, used. I just hit 45K.
My car was pulling left very noticeably. I got my alignment done at a local Hyundai dealership, and now it pulls right. The tech stated this is "road crown pull"...the alignment was brought within specs (green all around), and my tire wear is even all the way around.