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My explanation is that you need to do multiple tests, not knowing how you calculated your MPG.
The AC requires energy input so it cannot increase your mileage. It has to decrease it, all other conditions being the same.
It is very common to get different mileage on two different tank fills even though you think conditions and your driving was the same on each. The fact is, conditions can vary considerably due to a large number of factors beyond our control.
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