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Was the road/terrain maybe on an incline (even slight?), which could register as lower fuel and range? The readings and calculations might get more sensitive as the gas level drops.Another observation that I made was that at the fill point, it claimed ~500 miles +/- 10miles, as I drove, and added mileage to range it was showing closer to 530 miles until ~100 miles left, than the range started dropping faster than the miles I was traveling, even though I was still on the highway, at about the same speed I had been for the majority of the drive.