^Not to knock you, but 6500 km isn't going to show a drastic amount of wear at any pressure.
OP. I'd suggest running them at 35. I'd be willing to bet that you're only getting slightly better mileage by running them high and the rate that your tires wear out will probably outweigh that gain in mileage.
To check this, I would also suggest getting a tire depth gauge. This way, you're not "eye-balling" the tread wear.
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