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About 3 bar (we have metric air over here) that's a low 40's PSI.
More causes resonances and sounds which make long distance travel tiresome, and afaict hardly helps economy.
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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 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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