My father uses a smart cab, all four tires are pumped with N gas, and he told me that there is no much difference in handling and fuel consumption as mentioned above If you are driving hard(track days) then N will come in handy…because N is highly thermally stable,
** Atmospheric air contains 78% nitrogen, so after pumping normal air in to the tires the majority of air particles in the tire will be Nitrogen,I don't think pumping pure nitrogen will have a significant effect in daily driving.