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Originally Posted by dcb
On diesels the air is not throttled, thus the air fuel ratio is all over the place, usually very lean, so you cannot expect consistent results.
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Bummer. I had hoped the ScanGauge would give a more consistent result than the OBC.
I'll see how it performs after a few more calibrations.
Overall average and total fuel use wasn't very far off the mark on the last (3rd) fill-up.
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I would expect that subtracting .2 l/100km from the OBC in your head would be the way to go for accuracy.
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I'll have to work my way through 150-some fuelings and see what the average deviation really is.
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the on board computer should have a very good idea how much fuel it is injecting, or at least be off by a consistent amount.
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So I would expect, but it isn't.
10+ % deviation is enormous when you're trying to hypermile.
You think you're doing really great ... until you hit the fueling station