I'm thinking these wheels could be improved:
Instead of moon discs, wheels that are slightly "propellery" outwards in the front and inwards in the rear (not so that the they force the air, just so they allow it to pass as it wants) might do better.
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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)