I use a scangauge II. It becomes way off (from 2 to 15 mpg wrong over a tank) if I implement my EGR delete, go on a road trip, change biodiesel concentration, or make any significant change in driving technique.
Fortunately, I can calibrate it for B100, no EGR, and with my driving techniques fairly settled it is a useful tool for monitoring my daily commute over a tank, including some non-commuting driving over the weekends. I can make seasonable adjustments to maintain reasonable accuracy from spring to fall with B100 fuel.
Yeah, it'd be nice to have real fuel flow measurement.
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I'm not coasting, I'm shifting slowly.
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