You might want to start looking into what you can do about the shape of that trailer. The ideal would be to shape it into a boat tail continuation of the car, but it's ofthen not practical to go that far.
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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)