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Tire wear will not be even at higher pressure unless weight is added to press the tread surface flat once again. That is the actual factor involved.
More weight needs higher pressure in a given set of tires, but never enough to over-ride the maximum setting no matter what. The tire engineering takes into account the momentary increased load under a bounce condition or striking an object in the roadway, where the pressure will soar upward momentarily.
A tire designed for 80 psi will also expect a higher load. Without that load, the tire wear might become uneven.
It is far better to select a narrow tire width to increase mpg, IMHO, than to damage a wider tire by over-inflation. Trading mpg savings for an expensive tire replacement seems obviously counter-productive.
BTW, all tire pressure ratings are always assuming accurate measuring devices.
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