What would cause this tire wear?

[croatoan]

It's toe in. Jack up each side and mark a center line on the tire by rotating it and marking it with a peice of chaulk. You also need a tape measurer, 5' peice of angle iron, 2 framing squares and 2 C-clamp vise grips. Mark center line on both tires, clamp one square to one end of the angle iron and line up the outside edge of the square on the pass side chaulk mark, go to the drivers side line up the outside of the second square with the chaulk line and clamp it to the angle iron. Go back and make sure both sides are on the marks, adjust if needed, when happy measure with a tape. Write down the measurement, lay down the squares and angle iron rig and move it to the back side of the tires you should be able to slide it under and stand it up without unclamping it, repeat what you did on the other side of the tire. If the rear measurement is less than the front it's toed out (will wear the inside of the tires). If the raer measurement is more than the front it's toed in (and like yours will wear the outside of the tires).