Had a discussion with another forummer from Puchong (ahem) about why filling your tyres with Nitrogen actually has a difference. I was very skeptical about this, due to the nonsence that the guys selling this service have to say about it. Probably due to their own ignorance as well.Verdict is, yes, it made a noticeable difference (for me anyways). If anyone is due for a tyre change, or would like to try, I'd recommend it as well.