Mr.BHVM , a small correction and addition
Nitrogen in Service centres and Fuel pumps are scam.
But one in tyre shops (Special mention to MRF outlets) are generally best.
Personal advantage i felt with N2 is -
My ride had a puncture in a nearby town , from that to my town , about 35km , the car had run , the pressure drop in tyre was only 7PSI. The car was run to tyre outlet only after I noticed .(Rear tyre , so thereby can't be felt by driving).
If it had been case with normal air , surely , the ride would be in middle of road.
Case 2 - Sidewall hit , The hit was noticed only after 2km post hit , and the air leak was very slow.
Case 3 - Generally , i check up monthly once , and pressure drop is 1-2PSI alone.Tyre remains in optimum temperature with N2.
Why i told fuel pump and dealership scam is - They tend to fill normal air itself , and bill you N2. Ensure always N2 machine is a different unit , it consist of N2 filter membrane and you can ensure it , either the machine will have a rotatory knob(Just like fan regulator)- Which can switch to normal air /N2 as per the customer's choice.