Not being smart or odd or anything but is that what the trip computer said? I believe they can sometimes read a little off. In fairness, not that much off! Keep it up and compare your actual tank average to what the computer says is your tank average.
I use a scangauge for my mpg readout but it is notoriously inaccurate.
Keep up the good work. There's too few of us over this side of the pond!
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