I had a similar problem entering my first fill up after consuming the fuel the dealer topped off. I wanted to log the consumption of the first tank which Fuelly isn't set up to do well. I entered $0.10 as the lowest price per gallon, since it was actually $0.00. My average cost is off a little, but all the other stats work out well. I knew how many miles were driven the first tank so I counted from 0 to 536, my odometer reading at the time of first fill up.
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