Re: Excessive outer wear on front tires
Many people experience outer tire wear on their vans. I have experienced it myself and have read many comments on the Sienna chat forums from others experiencing it. In our case we checked tire pressure weekly, rotated tires at 5000 miles and go for yearly alignments. Had the suspension checked all okay - still had tires that wore out on the outer edges.
The sienna is a very heavy vehicle that will put a lot of stress on tires when cornering.
With tire wear there are almost too many variables too list. Some simple ones under your control are inflation pressure, tire rotation and alignment. It sounds like you are doing these. The quality of the tire, driving style, suspension component conditions, type of driving conditions also contribute to tire wear. In my case changing to a different tire brand and slightly over inflating my tires (38 psi ) has helped a little. I also have talked to my wife about turning the vans steering with the van not moving. She would actually leave tire marks on the driveway where she had scrubbed off part of the tire rubber when doing this.
If you type in outer tire wear in the search box at the top of the forum you will see may entries on this subject.