My 08 Sentra as built in MPG average only. It seems to use the same logic as my scangauge 2 that uses the OBD2 output because when I use the Scangauge to get real time MPG, the average gived by the car and the gauge come out identical once te car average stableizes (it's a bit eratic for the first few miles).
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-Miles
Best 15-mile commute city/highway mix: 37.7 mpg
Best tank so far: 31 mpg
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