When you try to convince your wife to walk the green line instead of you driving the red line to pick her up, because it's a big uphill to the turn and down again.
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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)