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Hey,
Depending on your road conditions, slightly over-inflating your tires is a common mod around here to gain fuel economy. As seen in the poll titled “What PSI do you run your tires” in the EcoModding Central sub forum, most members here run 35-45, but there are definitely some wild folks running 50-60 on their hypermiling builds (my account is too fresh to link it).
I do remember seeing a thread with some A-B-A testing of different tire pressure, but I’m having a hard time finding it. Other than tire pressure, as you probably know, the Scangauge II & Ultragauge are 2 tools that have a cult following around here for tracking fuel economy, throttle position, and all sorts of stuff. I’m assuming your cars already have live fuel economy readings though due to the age.
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