Inflating to the max rating is not " gross OVERinflation " Yes, many cars have a different rating from what's on the tire. No, it is not going to cause a blowout as soon as you start driving. Look at the Ford exploders that had so many blowouts and rollovers, that was due to what? under inflation! Leave your tires anywhere from the manufacturers suggestion (excluding Ford Exploders) and the max rating on the tire. Never ever trust a tire shop. They do not hire mechanical engineers to check tire pressures. I have no idea how many times I have picked up my truck to find it had 4 sloppy flat tires on it and goober was so proud because he caught my dangerously "over inflated tires" Yep, he put them all at 32PSI right where ALL cars should have their pressure set. I bumped them all back up to 42 on a 44max and no longer feel like I am driving on a marshmallow road. Same crap on my moms van. Some other goober set her tires to 32. They actually looked almost flat. If you hit a bumb the thing wallowed all over the road like the S.S. Minnow. Bumped up to 40 and it rides like a van instead of a shrimp boat.
Round tires roll easier, more pressure keeps them more round. That flat spot on the bottom kills mileage.
I own firearms not to fight against my government, but to ensure I will not have to.