Well I had the Nitrogen fill done.
I have TPMS so easy to monitor. The pressure still increases as the tyre warms up (seemingly about the same rate as with air) but if anything the change does seem more consistent across the 4 tyres. We will see how it goes as the autumn approaches.
That was my main concern. If it's as good as the claims then the pressure will not drop due to gas loss or temperature so they should not need to be topped up so often.
I guess I'll try it, if it works then it works. If I have to keep topping up then it will be back to air in time.
Thinking of replacing air with Nitrogen in my tyres (UK spelling).
Some reports say it's not worth it but it will only cost 10 GBP.
Anyone have any experience? I'm looking to keep pressure more consistent from cold to hot.