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I regularly kick my tires on the threaded side, a habit taught by my bike riding instructor, but practical on cars too. Pong, pong, pud, pong. Guess which one is low.
Once you get used to it you can tell the pressure from the tone, though that tends to rise a bit with wear. It also gets easier.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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