Quote:
Originally Posted by chops
get your facts straight. there's no fake science in this thread. if you actually bothered to google, as i just did, you will see that nitrogen molecules are in fact larger than normal oxygen molecules. pure nitrogen inflated tires will leak less and are less susceptible to temperature/psi variations as well as being lighter than your typical air (4% lighter, however fuel savings are negligible at best). while our air is 78% nitrogen anyway, the rest of the gases you fill into your tires will find their way out faster, hence why pure nitrogen is used more commonly today.
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The molecular size differential is 3%. The only reason the Nitrogen scam works at all is because the Nitrogen they sell you is dry. The key to consistent tire pressures is to put in a dry gas, whether Nitrogen or regular air. Fuel savings comes from having consistent tire pressures, nothing else.