I have a ScanGauge SG2, bought it in 2012. It has been very useful. In addition to tracking fuel economy, it also can be used as a gauge pod. And it can scan / clear trouble codes. I've used it as a code reader many times, on multiple vehicles. And I use it as an auxiliary gauge pod in my daily driver.
That said, if I were in the market for such a device today, I might buy something else. That's not to say the ScanGauge is bad. It's actually very good at what it does. But it's pretty basic compared to some of the other products currently available.
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