How does the evic calculate average mpg? Does the average span all the way back to when the reset button was pressed? Or does it only average the last 500 miles or something like that?

The reason I ask is that I haven't reset the average for a couple of tanks and the average had planed out at 24 mpg. Yesterday I took a 200 mile round trip all highway. I expected the average to go up but it went up a lot. It showed 30 mpg by the time I got home. That's usually what it gets on long highway trips.


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