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There are several options here.
- Fill up to the rim of the filler tube. That way you know it's full.
- Adjust the Scangauge to the average fillup. If it says 10 gallons and you put in 11, adjust it to 10.5. After a couple tanks, it'll average out pretty well.
- Keep a log with the SG readings and pump gallons. Calculate a running average offset and use that. I use this method, with a 12% offset (more gallons, less mpg compared to the SG default).
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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