nitrogen

No significant pressure loss. We checked shocks the night before each track event (practice or race) and topped them up with air using a high pressure hand pump. Never had to add more than one pump. We checked pressure before going on track but never had to top up. Been sitting in a cold garage all winter and now only down 20 psi. Your mileage may vary.
new shocks or old style

nitrogen

No significant pressure loss. We checked shocks the night before each track event (practice or race) and topped them up with air using a high pressure hand pump. Never had to add more than one pump. We checked pressure before going on track but never had to top up. Been sitting in a cold garage all winter and now only down 20 psi. Your mileage may vary.

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