Your fillup on Sept 12 is marked as a partial fill. When you do not completely fill the tank, no calculation is made for that tank, or for the next one as readings can fluctuate wildly for a partial fill and the next tank. Provided your next fill is a full tank, Fuelly will start calculating tank averages with your next fillup.
If the Sept 12 fillup was a full tank, and marked as a partial on accident, just go in and edit that entry, and remove the check from partial tank. Then calculations will be provided for the two entries.
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