Hi, dear all.
I have my first try on nitrogen inflation into my 4 precious XM2 tyres a month ago.
I had 4 long distance travels and each around 300km.
And one emergency brake due to some stupid sudden stop driver.
Now, my tyres only left 27~28PSI.
Previously all inflated with 32PSI of nitrogen.
Is that normal?

save your money

Perhaps u might get conned by the shop?

I dun think an emergency brake will decrease the air pressure by 4 PSI?

I stick with normal air pressure (since already 78% nitrogen) and check tyre air pressure regularly. Outstation trip? Will check before every trip.

I've been filling nitrogen into all my cars' tires since 3 years ago & it seldom decrease its air pressure unless punctured. I noticed significant improvements in terms of road noise when cruising in moderate & high speed along highways.

Btw, it does reduce the heat being generated after your outstation trip. Try to feel the difference by pumping normal air to one of the tires in front then another side, fill it in with nitrogen. After a drive to your destination outstation, place your hand on each of the tires mentioned & feel the temperature.

At least I noticed the difference.

Nitrogen is just a cheap source of dry air as the objective here is not to replace air with nitrogen but to remove the moisture from the air. One way is to use a scrubber to remove the moisture and pump dry air into the tyres (something which racing teams use). However that is expensive and the cheap substitute used by the workshops is to pump nitrogen since there is no moisture in the nitro tank.

The objective is to remove moisture in the air as moisture proves to be the uncontrolled variable in tyre pressure. Since the moisture is a variable (sometimes more sometimes less), in racing conditions, it is vital to control this variable and therefore dry air is used instead of normal air. This will ensure a uniform increase of tyre pressure when the tyre heats up without the moisture as an uncontrolled variable in the calculation.

Nitrogen does not reduce road noise since it is not a vacuum and the part that it plays in normal road car is minimal. Moisture in the air on normal road tyres does not affect the pressure as much since you are able to touch a normal car tyre even when hot. You can't touch a racing tyre when hot without burning yourself and the moisture in the air becomes a bigger factor.

Nitrogen is definitely the preferred alternative but it should comes as a free service instead of a charged service. The benefits does not outweigh the few ringgit that it is charged and the next time you pump normal air into the tyre, you will be putting in moisture again.