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One year ago I bought a ScanGauge E too and it was the best investigation. I expect that within the first year using it it saved me three times as much fuel than it's price.
As FordMan wrote it's an eye-catcher and more important than the street. So I placed it just behind the steering wheel.
The first year I let it display AVG (average consumption) and LPH (liters per hundred kilometers) what is typical for middle of Europe. So I learned how to drive the car most economically. Today it shows the speed (more realistically than the car's speed-indicator) and AVG as well. So this is the only device to look at while driving and there is more time to care for the street what happens.
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