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If the nitrogen stays in the tire while the oxygen and other components of air excape , sooner or later the tire will be filled with virtually pure nitrogen. I have never found tires to need less recharging as the years go by. I suspect the only real value would be the nitrogen is dry where most compressed air as water vapor in it.

Thank you, Yes it does have hoses as well as an electrical connection. Am I right in thinking it turns gasoline vapor back to liquid?

2009 SE V6. There is what looks like a good sized electronic box of some kind mounted under the car, and below the spare tire. Can anyone tell me what it is?

Grounding the Throttle Body will NOT make more power but the improved throttle response will improve performance.