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The claim. Filling tires with nitrogen instead of air is supposed to keep them fuller longer. (Tires that are correctly inflated give the optimum fuel economy and tire wear and are more durable.) Some tire retailers and car dealers offer a free nitrogen-inflation service; others typically charge about $5 to $20 per tire.
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The check. We took 31 pairs of passenger-car tires and filled one of each pair with air and the other with nitrogen, setting ...