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Also helium is very volatile; the small atom size means it finds a way through the tiniest of pores, even more so than hydrogen which forms molecules of atom pairs. You'd need to check the pressure much more often.
Helium would be lighter but that would just be one or two ounces per tire.
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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.
Last edited by RedDevil; 03-25-2014 at 06:39 PM..
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