Has anyone tested their inflation pressure compared to mileage BEFORE refilling with nitrogen and comparing the results?

If not, you can't say it improved because of the the nitrogen, if you aren't aware of exactly what the tire pressure was before refilling.

And yes, I'm skeptical that an increase of about 20% nitrogen is going to do anything.

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79 300SD - $50 out of pocket purchase
03 Dodge Ram 3500 CTD
2003 VW Jetta TDI