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I've been wondering the same thing with my SGII. It doesn't have alarms but I worry if it throws off the MPG calibration. I've forgotten a couple times so I just tell it I fill up when I remember and then just go on faith that the gallons it estimates are correct. Can always adjust calibration after the next full/accurate tank...
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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