One problem with this solution is that the energy has to go in and out of the battery, that loss might be bigger than the savings at the bearings. (At least with lead-acid.)
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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)
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