I enter data out of sequence all the time. aCar only seems to balk when the odometer reading that was entered is out of order based on the date.
In fact, once I used a $10 gift card at the pump, then filled up using my credit card. Even though I entered a partial fill-up for the gift card, I had to add 1 to the odometer reading for the second entry, even though I didn't go anywhere between fill-ups. aCar didn't like that I entered the same odometer reading for 2 different fill-ups, which is normally a good thing.
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