Welcome to Fuelly.com BuddyRich:
No, you are not doing anything wrong, But it takes at least three full fill-ups to start tracking aveages etc.
The Sequence of Fillups depends on the Odometer, and Fuelly then clocks from the lowest number (Starting Mileage). From then on, the Odometer (or Date for Non-Odometer Tracked vehicles), that is what fuelly expects.
(GasBuddy has a similar calculator, but IMHO, it does not do as nice a job as Fuelly does)
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