There was a recent article in the local paper concerning the use of nitrogen in tires. According to the article, nitrogen is being used in place of ordinary air in many race car tires. Drivers claim it to be less vulnerable to heat buildup.It is also claimed that since nitrogen molecules are larger than ambient air molecules that they are less inclined to leak from the tire. In areas that provide the switchover to nitrogen for the average driver, the article says that the cost is about $5 per tire and future fill-ups can be had at no charge.
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