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Ignoring the difference between "gauge" pressure and absolute pressure.
Atmospheric pressure at sea level is 14.7psi, but almost all gauges, including the ones you use to measure tyre pressure, read zero at atmospheric pressure. So the pressure in the gauge is the excess pressure above atmospheric - what atmospheric pressure actually is, is irrelevant.
By the way, I agree with Dave's pressures. I would add that you have to be more careful, and set a higher minimum, for low profile tyres, as the tread is likely to hit the rim at higher pressures, other things being equal. As with most offroad situations, the higher the sidewalls the better.
John
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ive got a defender running the factory grabbers......
on stockton beach i run them at 12 psi without any problems.....and thats with a fair bit weight on board.......
my defender doesnt really like the soft sand with any more air than than about 15 psi......
dropping to 12 psi makes it alot easier.....which reduces strain on the engine and other components.......
