I generally look at the tire sidewall, and go with max or near max pressure rated for specific tire. I believe my stock Murano's tires say 44 max PSI. More firm ride, and a couple of mpg better gas mileage on dry road surfaces. I will go down to 32-35 for winter snow/ice driving conditions and better traction.
The tire sidewall max pressure is a suggestion that people probably learned from their dads or an older mechanic. It does not apply anymore. Overinflating your tires to that degree will result in center tread wear.
The tire placard on the drivers door jam lists the correct inflation. I run a little above manufacturers spec, about 35F, 33R. The manufacturers spec tries to achieve a middle ground between ride quality and road noise. I prefer slightly higher pressure for sharper steering.
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