I noticed, the tires are worn out at the edges on two different cars, and different brand tires.
I never had "under inflated" tires.
For me it means to comply the spec. But now I realize, there is something wrong. The tire manufacturer or car manufacturer is wrong?
Probably we have to inflate the tires properly , not to spec?

 

the tires should be inflated to the placard setting located on the door jamb. If the vehicle was loaded to the max gvwr I would up the tire pressures to the max tire pressure located on the tire.
if you have irregular tire wear; post a picture of the tire wear. A knowing eye can identify the cause by looking at the treadwear pattern.