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I have a Turbo Diesel truck and set my Scangauge at every fill-up. When I first installed I left it at 0 and then when I filled, lets say 20 Liters or more I reset it and so far its been within 2% which I feel is not bad at all considering diesel fuel foams a lot and tank differential can exist. I found there is different readings for different fuel pumps. I do use a lot of fuel when I haul my camper and refuel maybe 2 times per day. I have a programmer and on stock it's close to 0% adjustments. On load A setting of the programer its at 17% more fuel to fillup, making the MPG reading much better. and at setting B on the Programer its at 37/43% setting making it much better on fuel millage. So I usually use load A and set the SGII at 17% on the plus side. I am very happy with this and most of the time the readings are equal to the hand Calc. numbers. So far I have raised my towing MPG by 2 and my Highway unloaded millage by 4. The best values have come with the cruise on. Most truck hics are not adjustable and never show the instant mileage easily, so the scangaugeII has been great for me. Yes my truck could show 8.9MPG and 129MPH. Or maybe lower MPG because at that speed I move tons of air that requires lots of fuel.
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