It think the main problems with Wankel engines go away when you just use them as range extenders.
Emissions: You never need to run them in a city.
Maintenance: A range extender in a 200km electric car might not reach 1000h of operation during the cars lifetime.
Efficiency: Not as important, see above.
That said, could a $200 piston engine last 1000h producing 15hp?
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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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