front and rear tire pressure settings on 2008 Buick Lucerne

I have a 2008 Buick Lucerne CXS wuth Factory 18" wheels. What is the proper air pressure settings for the tires on these bigger tires? TIM

Asked by for the 2008 Buick Lucerne
Here is a PDF file link to the owners manual for your car.
Page 5-67 talks about tires
Page 4-20 show tire decal location on your car
It seems to imply you must follow the pressures recommend on the decal on your car.