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A lot of it has to do with weather changes too since the temperature will have a big impact on the pressure readings. Warmer the temperature - higher the readings and vice versa. PSI readings will also go up as you drive and the tire and air in there warms up.
The rule of thumb is every 10 degree drop in temperature will lower your psi by 1 degree. So, take that into account as if the last time you reset it you filled it up and it was 90 degrees out in summer, and are checking when it's 35 degrees now in the morning, will be a huge difference. You'll see a bigger impact too if your car sits outside at night.
You also might want to try having your tires filled with nitrogen, too as it's a more stable gas, bigger molecules, less crap in there, and will hold a set PSI much better. Problem is it's harder to do yourself at home.
Signed,
Mr. Wizard
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