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Originally Posted by z3pilot99
We/I have a cable speedometer. It is a 1990 HF. So, do I still have a VSS?
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Might help:
http://ecomodder.com/forum/showthrea...html#post77756
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I think we also need to know the flow rate on the injectors.
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Not really. You can put in a guesstimate and calibrated it from tank fill-ups after. Have a search around the MPGuino subforum.
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With my ELD inop if I drive when it is dark and my lights are on can the drag from the altenator be causing a decrease in fuel mileage? That is the only real variable now.
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Yes. Curious to see your results when you get that sorted out.
Weather - wind, precip & temperature all have a fairly big effect on fuel economy as well.