I love my Scangauge. It will easily pay for itself. You can really see exactly how efficient your driving is and also how to most effieciently drive your car. I use the TPS (throttle position) readout alot. If I want to drive about 35mph, I will try to hold the throttle so I get a TPS of 13. 40-45mph usually a TPS of 14-15. Or a TPS of 15-16 for 50-55mph. The steadier I hold the throttle, the better my gas mileage usually. I've learned little things like how much gas the headlights use, or the difference in gas usage of sitting at a light in neutral or in drive. Lots of little things like that. My FE keeps improving because of the scangauge.
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