Over-inflating tires will actually accelerate wear. You have a smaller contact patch which increases unit loading on the compound, AND It typically results in the center of the tread wearing out before the shoulders do. AND The loss of dampening is harder on suspension components.

I imagine the smaller contact patch might reduce the risk of hydroplaning. I'm sure a tire expert knows the answer to that. Not me though.

A little extra fuel economy? Probably? Enough to be worth it? Your choice.

 

TIre wear tells a pretty straight forward story, excessive wear toward an inner or outer shoulder typically shows you need adjustments, excessive wear on both shoulders typically means under inflated, excessive wear in the center typically means over inflated. My experience is fairly limited compared to a lot of people, 1973 Ford Galaxie 500 ~8,000 miles, 82 VW Scirocco ~108,000 miles, 93 Ford Escort GT, ~82,000 miles, 2001 Hyundai Accent GS, ~ 87,000 miles, 2010 HHR LT 2.2L ~70,000 miles, and with the exception of the Accent, I've not had any excessive wear on any of them due to psi issues. I've always worked less than 10 miles from home, so no long commutes to rack up the kind of mileage most people see.

SO, I'm just going to let these pictures - of a tire on the LT which has been running at +8 to +10 psi for nearly 4 years now - tell a little story.... I don't have a tread depth gauge, but I do have a Mitutoyo dial caliper, accurate to +/- 0.0005 inches that reads in 0.001 inch increments, sorry it's a 12" instead of a 6":

Tread depth of first grove (from the outside) in tire = 0.218 inches:


Tread depth of the inner most grove = 0.216 inches


Now I've been running at +8 to +10 psi for about 30,000 miles for 2 tires, about 31,000 miles for the other 2, as I bought 2 tires last payday in April 2022, then 2 more last payday in May 2022.

SO,

Obviously,

I'm going to have more wear in the center of the tire.....

right???

Second grove from the outside:



OMG, 0.243 inches remaining tread depth? I've broken the laws of physics

OR

Maybe I measured wrong,

better check the other grove:



WHAT... 0.247 inches of remaining tread depth: well, there's only one possible explanation... we really are living in a computer simulation, and the simulations programming is starting to fail.... the end is nigh, the end is nigh, save yourself, oh wait if the end is nigh, then there is no way to save yourself

BTW, these are Hankook Ventus V2 Concept 2 tires rated for 45,000 miles: Starting tread depth 9.5/32 inch or 0.297 inches - recommended replacement @ 2/32" or 0.0625 inches remaining tread, and all 4 tires have similar wear pattern.