Usually once per week when I fuel up the cars.

Anyone here use nitrogen?

Between RM60-80 depending on the place you pump. Some will charge to topup but most don't if you are a regular customer.

Nitrogen is lighter, some say better fuel economy and car performance but considering it is only 3-5% lighter I'm doubtful on this.

The other is it is less sensitive to temperature changes as well as it stays consistent once you pump it. Useful for those who always drives up to highland areas.

It is a possibility but more likely the reason is the tire is a badly worn retread aka celup tayar and frequently most lorries are overloaded by at least 30% of their maximum permitted axle weight.