I have a local shop that fills my tires with nitrogen for free. I think they're standard charge is 7 bucks a tire (nothing compared to the dealership charges). I've ran Nitrogen in my tires for 6 years now and have never had to have them topped off. I know it's subjective as to whether or not it's beneficial, but I have never had any leaks since switching to Nitrogen.
Disclaimer: Some will say that a properly installed tire won't leak air either but the fact is that I've never had a car not leak air and I've never had a car leak nitrogen.
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