Best tyre pressures and operating guidelines for maximising mobility for people starting out with 4X4 driving - complete with the underlying beer garden physics of 'why' these recommendations matter.  
If you don't have time for the full version:  

Placard + 10% for highway and good dirt. 
Placard -10-15% for poor gravel roads with tread fracture risk 
25psi for general low-range off-road driving 
16psi for soft sand and mud 
12psi as a last-ditch resort to get out of a really boggy situation  

These recommendations only apply to standard-ish tyre sizes (not those absurd 35-inch tyres you see, from time to time, on heavily modded 4WDs).  
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