If you were to fill your tires with helium rather than air, would you get better gas mileage?
by 
breckords
ANSWERS: 5
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not able to be seen
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No. Because helium might set the tires on fire. I heard it is flammable. Or your tires will squeak in a Donald Duck way.
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In the standard tubeless automotive tire assembly, air permeates out at a known rate of 0-2 psi per month (reminder: check your tire pressure), and that air is a combination of mostly nitrogen (78%) and oxygen (which are both diatomic molecules). Filling them with helium (light atomic weight and elemental) is a terrible idea. The helium atom is about 3 times smaller than the Nitrogen molecule. If a material was invented similar to rubber, that did not allow the diffusion of gas through the wall, then there might be a different story.
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doubt it
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Nitrogen filled tires vary less on tire pressure and will directly relate to better fuel economy. The problem is that the nitrogen/oxygen combo is costly and willnot save you enough fuel to offset the cost.
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