Well i made a little 3p helper pack that i use on the way back, it keeps the current over 6A. Previously current on the way home was very low because the voltage of the main pack had sunk to not much above the cars regulated voltage.
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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)