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Because I can look at all kinds of data as I am driving!!
Instant MPG, Average MPG, I can look at my foot with the throttle position sensor gauge, I can look at the LOD or load the engine is at, MAP sensor, how much horse power I am using. $ per mile, The Air intake temperature, Water temp, clears and reads check engine lights. Once you get it you are shocked how you lived without it.
If you are broke get a OBD2 ELM bluetooth dongle a cheap android phone and a few apps that do the same thing as the scangauge.
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