Oh i do intend to calibrate it according to those instructions, it's just that i was out installing it today and needed reasonable starting values.
I ended up dividing that value by six and getting reasonable consumption figures - 2.1L/h immediately after start and sinking to 1.6L/h after a few seconds.
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)