I noticed you got XL which is rated for extra load. Those normally max at 51 psi. do you know if thats what they want you to run them because if so its going to feel like a brick...
DON'T EVER run your tires that high.
XL just means the manufacture made the sidewall to be able to carry more load than that size would have.
Basically, you can say in am example, maybe 215/40R18 regular sidewall can hold 85, but they have a XL option for 89. That doesn't mean you can run more PSI, that just means for that size you can run on vehicles with a higher load rating.
BTJ, just run whatever your door sticker says which is 32 cold. So in the morning before you drive around, make sure they are at 32, OR if you have already driven it then fill them to 36psi becuase hot pressure is different than cold pressure.
Filling your tires to the tire max is an improper way to fill your tires. You must fill it to the vehicles manufacture specs. If you over fill it will not perform as it should and you will wear the center of your tread very quickly which will void any millage warrant. It is just armature to look at the max pressure on the tire. You should look at your driver door sticker for the proper inflation.