I was waiting for someone to come up with something like this, but I was guessing saltwater ice cubes…
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Good one!
Consumer reports did that, except for a year at 30 psi, here’s what they found:
“Both tires lost pressure over that time, but the difference in loss was minimal. The average loss of air-filled tires was just 3.5 psi from the initial 30 psi setting. Nitrogen-filled tires lost an average of 2.2 psi.”