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A few years ago we had nitrogen in one of our cars which came that way from the dealer. The one thing I noticed in the 3-4 years we owned it is that it was at a stable PSI no matter the outside temperature. In NE Ohio that's a bonus. That being said I have air in our current vehicles and just check the pressure on a monthly basis and add air via the compressor in our garage when necessary. The RFTs on my 1 seem to hold air better than the standard all seasons on my wife's car which fluctuates a little more. But that could be anecdotal. Nitrogen doesn't seem worth the additional cost IMHO.
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