That is what I would expect as well. If that is a correct assumption why would it matter if its topped off or not? That shouldn't have any affect on the calculation. Hence, the questions

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Originally Posted by spiff72
I have a fuel economy/trip computer in my 02 Trailblazer, and I am fairly certain that there is a sensor that is monitoring the amout of fuel being used (instantaneously). I don't think that it is based on the fuel gage - I think this would be far too inaccurate.
It then keeps track of the cumulative instantaneous values, and uses those to calculate the average MPG.
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