Probably due to inconsistencies when filling up. Fill up only to the first click and get gas at the same gas station and pump if possible.
Gas stations are given a slight allowance so one station may have been more generous.
Also, the margin of error is quite large when filling up after such a short distance. Compare whole tank averages to get better data.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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