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Isn't there two? One says AVG, the other says TANK AVG?
This is correct.. One is an overall MPG average which won't change very often if you consistently drive the same way habit wise. The other will change during each tank and will reflect your MPG on that particular tank of gas. Check both and let us know what comes back. They should read different from one another.
In other words, the TANK AVG resets every time you refuel but the AVG one keeps counting until you manually reset? They should have this in every car. Yes, one average isn't enough haha.
If you disconnnect your battery both counters are reset. My overall average is at 24.8. I've had tanks as high as 28 and as low as 17. Depends on the mood.....