Since last >2 years I am using Nitrogen gas in my Car.Due to the N2 gas tyre pressure is maintained constantly at same level for longer period in comparison with compressed air which is having water vapour also.(water vapour can reduce life of tyre, tube and rim).N2 gas will not expand in hot season in comparison with compressed air.
Vehicle run very much smoothly because of tyre pressure remains constant in all 4 tyres(No uneven pressure in 4 tyres for longer duration).As well as getting good mileage and life of tyre, tube and of rim is increased.
If tyre is damaged due to any reason sudden blasting of tyre will not occur so same is good for safe driving.