If I get ready to travel one day and I check the tires and find out they are all 5 psi low, I air them up to where they should be at the cold pressure. The next morning, if the temp has dropped about 10 degrees, I find that the pressure in each tire has dropped down about 1 or 2 psi, I just leave it alone. If, when I get ready to start out and the pressure in the tires is a couple pounds up, I leave them alone. It appears that we can get into a nail-biting problem if we're going to get all concerned about the tire pressures each morning. Just be close to what they should be. That's been my experience and I haven't had a problem caused by pressures being up or down. Just don't move without airing up if you are 5-10 psi low.
I didn't get this from any tire expert, it's been my experience. Tire experts I have talked to all seem to agree with my approach.
Orv
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