Can you add air to nitrogen filled tires...or can you only add nitrogen? We're 20 miles from our nearest Costco - so we haven't bought tires there. But I need tires!

The only bad thing that happens about mixing air with nitrogen is you're diluting the nitrogen and therefore reduce its effectiveness. That's it. Nitrogen is more stable than oxygen.

You can add air, but the point of getting nitrogen is that it rarely will ever need air.

Now that I think about it - my air filled tires rarely need air. Maybe once since I got them. I bought my truck through Costco...might as well check out tires.

Thanks! Who knew!

Hmm, I'll have to Google that