I’ve got 16 thousand miles on my front tires at 20 PSI, even wear all across both of them even though more than half worn. Back tires have 9000 miles in them at 25 psi even wear across both of them. Now I agree if got seats and golf clubs hanging off back and 300 pound operator then will have to adjust pressure for load. That’s sweet spot for my cart setup.

Owners manual states 22 PSI recommended tire pressure, this is where we keep out tire pressure, 4 years no noticeable wear.

If your cart was made prior to the factory installing 10 inch tires then the use of the pressures stated in the owners manual is correct. That tire pressure is for the original 18x8.50x8 tire, 22 PSI is correct for that tire.
I am someone who works on golf cars everyday. I see worn out tires, everyday. The tire is telling you what it needs as far as alignment and tire pressure.
Look at rear tires on most yamahas. Inside and outside of the tire is worn out. Tire is telling you, too low a tire pressure. Now ask the owner what tire pressure they were told to put in it. Answer is 25psi, hence tire wears funny due to too low a tire pressure.
You will always have people who say they put this and that amount of tire pressure and that they get 100 thousand miles( joking of course) out of their tires....I dont see it ever and I work on thousands of carts a year. Do I see worn out tires in 6 months and low miles, yes. The reality is a loadstar 205x65x10, should last 20k miles plus properly cared for.