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most of the time the on board mpg display is off and the thing you want to use the scangauge for would be to watch Load on your engine which is one of the most important aspects.
Also slowing down will help incredible, while you accelerate you want to do so briskly and no to let the engine bog or anything like that.
That is why the scangauge is great it is more accurate and shows certain things that are happening with the engine that the factory gauges do not.
For good gas mileage you want less power, b/c less power= better mpg the more power you have the more fuel you will use
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