I have been using Nitrogen filled tires for autocross for a couple of seasons now, and I have found my pressures stay consistant throught the day. I no longer have to bleed off excessive pressure in between runs. My local tire shop fills an 11 gallon air tank for me to use to increase my presssure at the beginning of the day, and then I bleed off the excess before driving home. I plan on filling my tires with nitrogen when My ZL1 comes in this week.
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