2003 mitsubishi outlander rear tires tilt in

Preventing tire wear is about regular maintainence to your vehicle.
You should rotate your tires every 5,000 miles , and keep
your tire pressure at factory pressures as indicated by the tag
inside the drivers door column.
Alignment is another factor in tire wear , look at your tires carefully .
Look for any unusual wear , especally on the inside of the tires,
as this is usually the most troublesome spot.
As vehicles age , the springs lose their tension to a degree.
This causes a problem in the tire angle called "camber".
The vehicles wheels are tilted inward at the top.
Excessive negative camber will wear the inside of the tire.
Most vehicles can have this corrected by properly aligning
the vehicle .
Another wear problem can be caused by the toe adjustment
being out of specifications .
This is the most destructive angle to tires , it the same angle you use to steer the vehicle left and right .
It normally causes inner and outer tire edges to wear rough in
one direction smooth in another while rubbing your hand around the
tire.
Both these angles can be corrected by a professional alignment .
Be sure the technician inspects your front end for any worn parts,
as aligning it with them is a waste of money and time .
Always ask for a before and after printout of your alignment.