As a former tire tech, I will just say that if you don't SEE them fill it from a nitrogen tank, don't believe for a second they did. I worked at a shop for 3 months and was never taught how to do anything related to nitrogen beyond swapping to green valve stem caps. Pure 20 dollar cash grab.
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2001 Prius - 170,000 KM - just got it (no consistent FE numbers yet)
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