Tire pressure

For most vehicles,  its common to find synthetic tires installed  as they tend to be more affordable.  So the question is, what's the right tire pressure? 
I will say between 40 -45 psi for suv and sedans. But as a owner always look for the maximum psi as written on the tire. The trick is to gauge your tires 2-3 psi below stated maximum.  Eg. if max is 44psi, pressure tire up to 40-42psi. This way your tires last longer.