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Title: The best part to modify to save gas is the driver
Review: Since I started using ScanGaugeII, my average gas mileage (1999 Nissan Maxima 5spd) has gone from 26 to 29 MPG, just by knowing what helps and what hurts my mileage. I keep mine set to IGN, MPG, MAP, AVG. This tool makes it easier to determine when you should shift for optimal mileage. Turns out I was actually shifting too early most of the time. Amazon is the cheapest place to buy one of these, and if you use it properly, it will pay for itself pretty quickly in fuel savings.
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