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Well is it worth spending extra $$ to put 100% nitrogen in a tire vs air that is ~78%nitrogen 21% oxygen
1% other?
It is real easy to get "data" showing just about anything is true - even that 100% nitrogen is less likely
to migrate through tires than 78% nitrogen (aka air). It is even easier to understand race car teams will
use 100% nitrogen when they get paid money to do that.

Why not go for some actual test data to evaluate the advantages!
National Highway Traffic Safety Administration DOT HS 811 094
If we take the average of all tires we tested, the use of nitrogen-inflated tires decreased the
amount of pressure lost by 35 percent over the first 90 days, while the advantage of using nitrogen is
predicted to decrease to 24 percent over a three-year period compared to an air-inflated
tire. . .
The study indicated that inflating with nitrogen in place of air had no immediate effect
on laboratory tire rolling resistance. However, it is estimated that at the end of 90 days of onvehicle
service with no inflation pressure maintenance, the improved retention of inflation pressure using
nitrogen versus air inflation will result in a 1.5-percent reduction in tire rolling resistance.

Other often stated advantages are that the filling with nitrogen process results in less reactive lower
water vapor environment. Significant for a high performance aircraft or racing car but of dubious value
for a passenger car.

My take; perhaps worth $5 a tire at most but by far the best thing you can do is check your tire pressure
every 4 to 6 weeks.

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