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My Insight was dead on on one trip of 650 miles. Refill calculation was exactly the same as the dash fuel mileage reading 70.2 MPG.
My Altima and the wife's Sorento both are optimistic by right at 5% as Daox posted in the above thread.
Both based on actual refill volume. If I had a scangauge I would adjust it to read as close to actual refill calculations instead of instrumented calculations.
regards
Mech
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