Prakhonchai Nick
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I hope when you give them a rest you give them only best Nitrogen to fill them.
This is a up and coming BS to a tyre store near you. The theory is that the molecular size of Nitrogen is larger then oxygen and your tyre's will deflate less over time, as the Nitrogen permeates less then the oxygen. Having said that there is 21% oxygen in air and the rest is mostly Nitrogen anyway. So unless you are driving an F1 car forget it. It is available in Thailand now at 250 Baht a tyre.
The garage within the Makro complex have nitrogen for anyone daft enough to want it.