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Doing pure nitrogen doesn't really offer any benefits to your tire PSI when it's cooler. You're still going to have to add some nitrogen or air when the temperature drops. There's only about a 20% difference between regular air, which is already composed by 78% nitrogen.
Are you measuring your tires before you drive the car?
Only real benefit to using pure nitrogen is that the tires won't heat up as quickly when driving. That and it'll delay dry rot by a bit.
If you're within 0.2 on each tire, you're fine. Adjusting it so you have a difference of 0.0 won't noticeably change your gas costs per year (probably less than $10-20, but is it worth the headache to get it that exact each time?).
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