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Just filling up itself is inaccurate. when I record mileage, I put the mileage down, and the gasoline I just put it. That isn't necessarily what I burned on the last tank, its what I put back to replace it. Iv seen my car take 10 to well over 13 gallons from empty (light on) depending on the pump, and the person putting it in. I rescued my G/F with my car, and had to let her use it for a few days, and my fill-up error was insane. My last 4 entries were (MPG) 26.20, 38.38, 21.27! and 42.49!! It all averages out, but you need a few consistent fill ups in a row to set a trend. One optimum trip is great @ that mileage, but its averages over time that will impress the most.
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