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I'd like to put my $0.02 cents in on this matter- I work as a service valet at my local Volkswagen dealership. Customers often come in to have their tire pressures checked and tire dummy light reset. This service is provided free of charge. However, sometimes certain customers insist I fill their tires with nitrogen. We have a nitrogen machine in the shop, and I could do it, but it is expensive and nobody wants to pay for it. So my boss tells me to use regular air.
The way I see it, regular air is almost 80% nitrogen. Nitrogen is a colorless, odorless, neutrally buoyant fluid when released into the atmosphere. If I were to line up two identical cars, one car with nitrogen filled tires and one with standard air, there would be no appreciable difference between the two. So I do not feel bad about misleading the customers. Besides, it's free!
So, that's my two cents!
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