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In lieu of having an actual BSFC map for one's particular engine, would the Gallons/hour setting on the scangauge be a fairly good indication of how efficient your speed is?
Usually when I'm cruising on the interstate, the GPH readout is between 1.4 and 1.8 GPH; but it also reads similar number quite often at lower speeds, like suburban streets at 45 mph...
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