I'm a 36 psi guy and maybe a touch more in the spare.
Found this (Note: it's from Australia so "Utility" means "Pick Up")
Quote:
Small Vehicles
Car Type : Pressure Range : Optimal Pressure
Standard : 30 - 36 Psi : 32 Psi
Sports : 32 - 38 Psi : 36 Psi
Wagon : 32 - 40 Psi : 38 Psi
Utility : 32 - 40 Psi : 36 Psi
Medium Vehicles
Car Type : Pressure Range: Optimal Pressure
Standard : 32 - 40 Psi : 36 Psi
Sports Car : 34 - 42 Psi : 40 Psi
Wagon : 34 - 40 Psi : 38 Psi
Utility : 32 - 44 Psi : 40 Psi
Large Vehicles
Car Type : Pressure Range : Optimal Pressure
Standard : 36 - 42 Psi : 38 Psi
Sports : 36 - 50 Psi : 44 Psi
Wagon : 38 - 46 Psi : 42 Psi
Utility : 40 - 50 Psi : 44 Psi
Here
http://www.ozzytyres.com.au/blog/what-is-the-ideal-tyre-pressure/