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I usually check mine before I head out on a long trip. I have had one drop down to 70 psi and never had a problem. Would I drive on a Marathon at 70 probably not, but I do not fret as bad on my LT's. If they get below 70 psi I feel I can visually see that. I do a walk around at every stop for fuel where on pavement it would be obvious if a tire was lower then the others. I may get one of those thermal temperature gauges some time here to make it more accurate. Unless I have had a problem mine usually don't lose more then 5 psi a year in sitting and many short and 1 or 2 long trips scattered in that year.
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