Noticed our '19s tires were also "high" when checked on info screen, so check with gauge, it was showing same, but it handles well and rides good still. I'll likely leave them alone, they'll wear anyway.
The tire's sidewall spec is usually, that PSI required of that tire to carry the weight it's rated for. Less
, and the tire will safely carry less weight. The PSI listed on the door is enough to carry the vehicle and manufacturer's recommended load maximums.Tire construction also plays into it. A lightweight tire with thin sidewalls designed to run elevated speeds … like pursuit tires on police cars, will use / need higher PSI to meet the load requirements. A tire with stiffer sidewalls will need less PSI and will run hotter due to internal ply friction at the higher speeds.
A few extra PSI over top of door sticker specs is where I like mine, I like crisper handling. Ride isn't hurt too much, tread wears maybe more in center, but I like the feel.
I'm getting used to this Sport still, but as an example, I run Goodyear RS-As on my wife's Mustang and our Mercury GM and on two T-birds, they show 44 on sidewalls, I keep them at 40 anyway. They wear great, and feel great, and I do watch wear patterns.
During my career as a state LEO, I always ran the tires at the PSI on the sidewall, always
. Served me well.
… And buy (?) a roast chicken while you're there, I guess.
On a vacation trip in the Merc a few years back, I stopped to get an oil change at Newton, Ks. at an oil change place. Came out and drove away, and turned back, they let my tires down to 32 psi and the car was squirrely …. had them put back to 42 psi. Guy thought I was a loon, but I was the one driving it.
I don't mind eating at a Costco, I like the sampling & I'll check with my T-wrench anyway.