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There should be a few different gauges for average mpg. "current" gives you your average since you started driving that trip, "tank" gives you your tank average, "today" gives you the average of all the trips made that day. I'd imagine you're just looking at the current average. This is the "AVG" that shows up on the SG-E's main display. I believe if you hit the menu button, then the lower left button you can get to the other averages.
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