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You are joking yes ?
They say .."Nitrogen molecules are slightly larger than oxygen and so seep out of the tyre about 3 - 4 times slower than compressed air. This means you will see a decrease in pressure of around 1psi every 5 months."
True no doubt but if you check you tyres pressures only 4 times a year you have negated any possible benefits of using nitrogen IMO.
I use the 80% stuff - its free.
Its to scare idiots who never check their tyre pressures into parting with money - they probably deserve it.
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