Dash indicator will be bogus initially, probably from the initial dealer idling, moving in parking lots, et cetera. I reset it after a while it is now much more accurate to my calculated values. I have always calculated mileage every tank for all vehicles, that way I can track it and see if there are any trends indicating a possible problem (and for general interest). I now have 1700 miles on it, and have been consistently getting about 22.5-23 MPG (calculated, but now matches display pretty well). This is mostly freeway/in town, some rush hour (which actually improves mileage because of the hybrid system). Stock ORP.
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