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I check my tires often until I can see a pattern of pressures as well as any coasting reduction. The worst for loosing air pressure are tubed spoked motorcycle tires, probably the Chinese tubes are the biggest culprit.
The Fiesta and the wifes 2012 Sorento loose very little air over months. In fact this last spring as temps rose the pressures actually rose slightly as the air in the tires heated up, even measured cold. In fall it's the opposite, pressures drop as the air in the tire cools.
Fortunately the truck wheels, bought used and 15 years old, also hold air almost as well as the Fiesta and Sorento. The last time I had a tire loosing air faster than the others, it had a nail in it. I plugged it myself in the garage and now it holds air just like the rest.
If you have a significant loss of air pressure then when the tires are removed from those wheels, I use a abrasive wheel on my drill to clean the bead contact area of the wheel, then spray som paint on the exposed metal, also always use a new valve stem and check the area around the stem to make usre it is clean and smooth, use the same technique as the bead area of the rim.
Once I get a stream of data about my tire pressures on all of my vehicles, then I check the pressures less often unless I get a coasting reduction.
New cars with original tires seldom loose air pressure at any significant rate. Even after a year off the road, my salvage rebuilt Altima still had enough air in the tires to not set off the TPMS dash indicator. It also helps to have a compressor in your garage.
101 volts, unless the tires are very old, they should be date coded, so you can tell their age.
regards
Mech
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