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No, tires filled with nitrogen give exactly the same fuel efficiency as tires filled with air.

The real reason tires on many modern cars are filled with dry nitrogen is that air contains a small amount of water vapor which condenses out in cold weather. The resulting small drop in tire pressure is detected by the electronic tire pressure monitoring system, which gives a false warning. As dry nitrogen has no water vapor to condense its use eliminates these false warnings.

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Q: Does Nitrogen in tires increase fuel efficiency?
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