My scangauge is usually within .5 of a gallon on fillups...seems pretty accurate to me.
Are your sure you have diesel selected as fuel on yours?
Quote:
Originally Posted by dcb
obdII solutions do not track fuel usage well on diesels. They assume a 14.1 ratio and watch the mass airflow.
Diesels (due to lack of throttle plate and compression ignition) do not operate at a relatively fixed mixture.
I don't have a good solution for diesels handy, have been thinking about it plenty though.
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