mtgeekman -
Quote:
Originally Posted by mtgeekman
The reason the numbers between the insights FCD and the Scangauge done match up is because of the lean burn.
The scan gauge doesn't monitor weather you are in lean burn or not. so it bases its calculations on a air/fuel ratio of 14.7:1 and assumes that this number does not change.
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That's what I was thinking. The SG is a (very good) Jack-Of-All-Trades, so it doesn't do as well with cars that employ special MPG strategies like lean-burn.
If the OBDII protocol had specified some kind of (averaged?) fuel injector pulse-width, or just a plain instant-MPG parameter, then the SG would be more accurate. However, that would have made cheaper copy-cats more accurate too, so the "luster" of the SG would not be as great.
CarloSW2