Went in to look at buying a new vehicle. Every sticker had almost $1000.00 in extra mark ups consisting of: "Desert Protection" Window tint Lifetime nitrogen SO......If you want to buy some snake oil, and over pay for tinted windows, stop on by! An extra charge for nitrogen in tires is a joke. The air around us is 78% nitrogen. Race Cars use nitrogen, as they have to get tire pressures within half a pound, or less, and nitrogen doesn't promote combustion in a crash. Aircraft use nitrogen in tires as it holds less water vapor, and doesn't promote combustion in a crash. Unless the tires are properly purged of all ambient air, they are not being filled with "pure" nitrogen anyway.
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[1].