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I just order some 215/45/17 bfg kdws for my oem 17x6.5 rims. What psi should I have them fill the tires to. I know that they will fill to the oem regulation but I know that they should be over inflated a little bit. Also, should I ask them to fill the tires with air instead of nitrogen? I plan on doing some autox events and I know i'll have to tinker with the tire psi later down the road. Is it ok to mix nitrogen and regular air?
 

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The air you breathe is around 80% nitrogen already. There would be nothing wrong with topping off nitrogen-filled tires with regular air.

Those are really close to OEM size, so I would stick with OEM specs for daily driving. Maybe +1 or +2 psi depending on your preference.
 
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