I think the current regulations which warn you of low pressure have lured people into thinking tyre pressures are correct unless they get a warning. I think the systems are really just there to alert of punctures rather than under inflated pressures, and I don't know of any system that alerts of over inflated tyres. Its a regular post on the owners group "whats wrong as all my tyres are showing 37psi" when the correct pressure for their car is 42 or even 45psi.
As for the nitrogen debate, I'm happy with air and check the pressures fairly regularily - it takes seconds in an MS to do so as you set off on a journey. There's far more variability in life with tread wearing down, road surface, temperature etc to worry about pure nitrogen.
As for the nitrogen debate, I'm happy with air and check the pressures fairly regularily - it takes seconds in an MS to do so as you set off on a journey. There's far more variability in life with tread wearing down, road surface, temperature etc to worry about pure nitrogen.