You're right GM that underinflation can make the edges wear. It can also be an alignment issue and sometimes simply bad driving habits. I see a lot of it through work.
Some tyres are more prone to wearing the shoulders though, due purely to design.
Others wear edges because of the set up of the vehicle and the camber on NZ roads. ie an AWD Prado will wear LF outer edge faster than any other tyre on the vehicle.
If we drove the same vehicle on the RH side, the predominant wear pattern would be on the outer of the RF wheel.
As VC said, buy the best you can afford, vtf.
There are cheap budget type tyres that perform adequately, but then there are expensive tyres that do the same but last much longer.
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