thank you, kind sir!. This is almost the same exact answer I got from an engineer at Michellin about 30 minutes ago! I am currently in school for engineering physics and should have trusted what I learned in classes more than what I thought off the top of my head as "I am sure it will be fine."

Good luck! I enjoyed the materials science and strength of materials courses when I was in engineering school. You gain a lot of insight for your intuition on how "safe" something is or not when they teach you to think like an engineer. I ended up finishing with a minor. You probably didn't exceed the speed rating of the tire on your trip, but when you consider a tire can blow out at 35 PSI hitting a pothole, I wouldn't play around with it. I mentioned your situation to a friend who inflated tires on his truck to the rated pressure once, one blew on the highway and demolished the rear half of his truck. Did your dealership inflate the tires like this?

it was a brand new car picked up wth 2 miles on it so it was either the dealership or manufacturing plant (a Canadian built Rav 4) but I think the blame falls on the dealership; I asked to see the checklist for preparing new cars and one of the items said "check the fluid levels, tire pressure, fuel level", etc. and it was checked off as completed. I thought maybe the final assemble left the tires high PSI to check the bead seal or something, and the dealer is supposed to put them down to the service level on arrival? the tire sizes are p235/55 R19 and I also thought maybe some untrained service tech doesn't know what number to use for tire pressure, saw the 55, and aired them to that, but that seems incredibly stupid. I foolishly at first was only looking at the TMPS screen and saw the 55 PSI, but When I went back and checked with an actual tire gauge the front tires were 57 and the left rear that didn't go flat was at 67PSI. I started to get paranoid that maybe the dealership did it on purpose to make the tires wear out quicker or to be jerks because my girlfriend refused to buy their tire protection plan. i have to go back tomorrow to talk to the service manager.

ok, thanks. I assumed as much; I just wasn't sure since one blew up already when I was in the military working on helicopters, any time anything exceeded a limit, it had to be replaced.

Just let the air out, and do not use them on helicopters - it is not safe 🙂

If that's missing (rot ate mine) the tires always have a max load/max psi rating as well. I would say check the owners manual but those are less useful than tp these days.

Generally I just keep it 10-15psi below max but that's only because I know how the truck is going to react & what load I'll be carrying.

I am aware of the proper pressure on the sticker; the question is if the tires should be replaced since they have been driven around for 300+ miles with the tires overinflated 15 PSI+ over the max rating for the tire. The owner's manual for the tires says "never inflate the tires above the max rating displayed on the sidewall." if it was just over the recommend PSI on the sticker I wouldn't mind and would just deflate them and not have posted the question, its that they are over the MAX PSI rating for the tire, One tire already exploded, probably from/or with help from the over-inflation.
I called Michellin and they told me over inflation voids the warranty and the tires are unsafe, but wasn't sure if that was just a lawyer's answer and not a mechanic answer. I'm going to forward this information to the dealership and go from there.

You didn't mention anything about explosions in your original post. If you have blown out tires (sounds like cheap tires to me) & already had your answer, why are you asking?

well.., I assumed I could get a second opinion from someone who knew more about tires than I do at the moment and get an answer to my specific question instead of random lazy answers to check the sticker, that didn't pertain to what I was even asking. niether ote responses turned out to be relevant or correct.