Tires: passenger tires, toyo tires, target value

Question
I have Hyundai sonata. bought 4 Toyo tires from the dealer they are wearing well but they " sing" (loud road noise)The dealer checked the alinement and the balance and found everything good. The road noise has been getting louder. I have about 25,000 on them. The tread is good. I keep the inflation at 30 pounds which is spec.

Answer
Ken

What you probably have is irregular wear.

Irregular wear is caused by misalignment and aggravated by insufficient inflation pressure and insufficient rotation practices.

My experience says that the published alignment tolerances are too wide.  Not the target value, but the allowable deviation from that value.  I think it ought to be half of what is published.

Put another way, the alignment should be within the inner half of the spec.

You should be aware that even vehicles that do not have a pull can be out of alignment.  There are settings where one out of spec condition is offset by another out of spec condition – typically camber vs toe.