Why not note the amount you spent at the pump on your first full tank entry? Just add in the comment section something like, "I spent $35 on last tank but don't know the mileage." Or, figure out how far that money would have taken you, and adjust your full tank numbers accordingly, neatly squeezing 1-1/2 tanks into one entry. I don't see the need to add more complexity if it's only going to help you for one single (and incomplete) fuel log entry.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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