Corvette Differentials and Handling!

I worked in the HVAC profession. I've heard of guys putting in R22, or other refrigerants to get to an air fill-up station. It actually was a dangerous thing to do, because the pressure increased dramatically with temperature. It's a direct relationship. 

And yes, nitrogen expands slightly less the the other gasses in the atmosphere.  So a bit less expansion than dry air.   Not a lot, but a bit.