Nitrogen vs compressed air for our tires

Once again a major publication is promoting we consider replacing compressed air in our tires.  The latest is the FMCA.  In -

www.FMCA.COM//polks-top-7/3380

Ron Polk suggests a number of reasons to consider nitrogen.  Here are a few counter points left over from high school science.

• Air is made up of 78% nitrogen, 21% oxygen and the rest are trace elements. So, the most we can add is 22%. more nitrogen.
• The atomic weight of Nitrogen is 14, Oxygen 16 making Nitrogen about 10% lighter than Oxygen.

So, to replace 22% of air with a product that weights less than  10% less means that the new composition weights 2% less. Remember, all the assumptions are based on changing just 22% of the material in the tire with a product that has ONE PROTON.

On an RV tire that weighs approximately 75-150 pounds, ask yourself if 2% less air makes sense.

COMMON FOLKS !  Please help me.